Harr Clinical Chemistry Practice Test

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• Which formula correctly calculates the oxygen content in the blood?
• What is the triglyceride concentration in the patient's sample using a glycerol kinase method, given standard and absorbance results?
• What is suggested by a pattern of increasing troponin concentration over time in a suspected cardiac event?
• Which statement regarding the measurement of Hgb A1c is true?
• What symptom is typically associated with elevated prolactin levels?
• When a 22s rule is broken in QC, what should be documented?
• What primarily induces acidosis in cases of alcoholism, liver failure, and hypoxia?
• What is the principle behind bichromatic measurement of absorbance?
• Which type of detector is the most commonly used in clinical gas-liquid chromatography (GLC)?
• What percentage of HDL's weight is composed of protein?
• How is urea concentration calculated from BUN?
• Which substance has the longest detection time in the body?
• Which stationary phase is used for the measurement of hemoglobin A1c by high performance liquid chromatography?
• What is the primary clinical utility of measuring CEA?
• Which of the following conditions is associated with an increase in ionized calcium (Cai) in the blood?
• Which condition can result in acidosis?
• What does a monoclonal band identified by immunofixation electrophoresis indicate?
• What conclusion is drawn when the F test critical value is greater than 2.8 comparing two osmometers?
• Which condition results from deficient secretion of bilirubin into the bile canaliculi?
• Quantitation of a drug by gas chromatography-mass spectrometry (GC-MS) is typically performed in which mode?
• Which material is best suited for verifying the wavelength calibration of a spectrophotometer?
• What is the normality of HNO3 when its molecular weight is 63.0 g?
• Which condition can cause an increased anion gap?
• Which element is reduced at the cathode of a Clark polarographic electrode?
• What is true regarding the use of PTH in calcium metabolism disorders?
• Which wavelength would be absorbed strongly by a red-colored solution?
• What does the Clark electrode measure?
• What indicates a proportional error in the results when comparing two methods?
• What is the confirmatory method for measuring drugs of abuse?
• Given the following serum electrolyte data, what is the anion gap: Na = 132 mmol/L, Cl = 90 mmol/L, HCO3- = 22 mmol/L?
• In addition to blood glucose and Hgb A1c, what test should be done annually for diabetic persons?
• How do you determine the micromoles of NADH consumed in an enzyme activity test?
• Which method involves measuring current to detect end points in titration?
• Which reagent is essential in the coupling enzyme reaction for generating a colored product in the cholesterol oxidase method?
• What would be expected in a patient with Dubin-Johnson syndrome?
• Which profiling technique is preferred for drug testing due to its sensitivity?
• Which procedure can be used to detect proportional error in a new method for glucose?
• In calculating the relative centrifugal force of a centrifuge, what additional variable is needed beside velocity?
• Which substrates and coenzymes are required for the enzymatic measurement of ammonia?
• What is true about the behavior of a red solution regarding light absorption?
• Which statement about PSA is correct?
• In which condition would an elevated serum alkaline phosphatase be likely to occur?
• Which statement accurately describes GH deficiency?
• Which enzyme is particularly elevated in hepatoma patients?
• What is a diagnostic criterion for diabetes mellitus?
• Which method is most useful when screening for errors of amino and organic acid metabolism?
• In what situation is chemical interference typically indicated regarding calcium measurement by atomic absorption?
• How many grams of KH2PO4 are required to make a 20.0 mmol/L phosphoric acid buffer, pH 3.50?
• What condition can cause increased acid excretion in metabolic acidosis?
• The freezing point osmometer is different from the vapor pressure osmometer in that it is sensitive to which substance?
• Which statement regarding the diagnosis of iron deficiency is correct?
• Which of the following is more commonly associated with a nonmalignant form of monoclonal gammopathy (MGUS)?
• What type of error is characterized by some results being affected unpredictably?
• The response of a sodium electrode to a 10-fold increase in sodium concentration is expected to be?
• For optimal accuracy, how frequently should cardiac markers be monitored in suspected AMI cases in the emergency department?
• Pharmacodynamics is best defined as:
• Which enzyme is often elevated in both necrotic jaundice and obstructive jaundice?
• What is the pH of a buffer containing 40.0 mmol/L NaHC2O4 and 4.0 mmol/L H2C2O4, given pKa = 1.25?
• Which statement regarding Cystatin C is true?
• Which 2-hour glucose challenge result is classified as impaired glucose tolerance (IGT)?
• In a reported lab result showing a pH of 7.42 and a bicarbonate of 24 mmol/L, which value is most likely erroneous?
• What is the primary use of the Hgb A1C test?
• What impact does a competitive inhibitor have on an enzyme reaction?
• Which reagent is necessary for solubilizing unconjugated bilirubin in the Jendrassik-Grof method?
• On which day should patient results be rejected when a clear trend is observed?
• What must be considered when evaluating a patient with signs of drug toxicity?
• Which statistical test is appropriate for comparing the means of two methods?
• What describes an R4s error in QC?
• Which bilirubin fraction is predominant during necrotic liver disease?
• What additional measurement is required to assess the predictive value of a negative test result (PV-)?
• What is the best single screening test for pheochromocytoma using 24-hour urine?
• What hormone is primarily responsible for promoting hyperglycemia?
• The half-band width of a monochromator is defined as what?
• Which of the following can cause an increased retention of bicarbonate?
• Which of the following statements regarding enzymatic reactions is true?
• Which of the following conditions is classified as normochloremic acidosis?
• Which of the following is affected by renal blood flow and can influence BUN levels?
• What characteristic of NADH relates to absorbance measurements in enzymatic reactions?
• What is the primary mechanism for vasopressin (ADH) release in the body?
• What four parameters are required for calculating eGFR using the MDRD formula?
• When measuring calcium by atomic absorption spectrophotometry, which is essential?
• Which statement about catecholamines is correct?
• What should be the first course of action if a spectrophotometer's readout does not rise above 90%T with the light path fully open?
• When do symptoms of alcohol intoxication typically begin?
• Which type of filter is most effective for measuring stray light in a spectrophotometer?
• What is the best course of action if the steady-state drug level is too high?
• The reference potential of a silver-silver chloride electrode is primarily determined by?
• Regarding cortisol in Cushing's syndrome, which statement is true?
• Which substrate concentration is necessary to achieve zero-order kinetic conditions?
• Which statement about colorimetric bilirubin methods is true?
• Which statistic is most appropriate for determining if bias is present when comparing a laboratory's monthly mean to its peer group?
• Which test is not primarily used for detecting myocardial infarction?
• Which statement regarding serum urea is correct?
• In the case of abnormal hemoglobin present, what is the reason for caution in measuring Hgb A1c?
• For a patient with acute inflammation, what would cause levels of ferritin to be elevated?
• If gastric fluid from a suspected overdose of amphetamines is sent for analysis, what should the technologist do?
• Uric acid is primarily derived from the catabolism of which substance?
• Which enzyme deficiency is primarily associated with familial hypertriglyceridemia?
• Considering the serum protein electrophoresis pattern, what is expected for transaminase results in hepatic cirrhosis?
• What is the main estrogen produced by the ovaries used to evaluate ovarian function?
• Which definition best describes the catalytic activity of amylase?
• Which rule would you use to identify a significant random error in a QC chart?
• In a patient with suspected coronary artery disease, what is the significance of a normal CRP level?
• What effect does the ionic strength of the buffer have on the electrophoretic movement of proteins?
• What is the most probable cause of low detection limits observed in the second serum sample from a metabolic function profile?
• The serum level of which of the following laboratory tests is decreased in both VDDR and VDRR?
• Which compound can interfere with the coulometric chloride assay?
• If the peak level is appropriate but the trough level is too low, what should be adjusted?
• Which method is commonly used for measuring fractionated catecholamines?
• For determining systematic error in a laboratory's monthly means, which plot is utilized?
• What is a correct statement about gestational diabetes mellitus (GDM)?
• What enzyme is likely elevated in muscle wasting disorders?
• Which metabolite is often elevated in carcinoid tumors of the intestine?
• Why is GGT considered a sensitive marker for liver disease?
• Which statement regarding bone-specific ALP is true?
• What is the daily iron requirement for pregnant women?
• Bilirubin is transported from reticuloendothelial cells to the liver by?
• What effect does hemolysis have on LD levels?
• Convert 10.0 mg/dL of calcium to International System of Units (SI). What is the result?
• What effect does alcohol have on iron absorption?
• What causes pre-β lipoproteins to migrate faster than β lipoproteins in agarose gel electrophoresis?
• In which condition would hypochloremia be expected?
• What component is essential for the separation of hemoglobin variants in citrate agar electrophoresis?
• What is the outcome when the slope of the linear regression line is low?
• What assay is used to confirm borderline cases of hypothyroidism?
• What is the most likely cause of pseudohyponatremia in a patient with significantly high triglycerides?
• What role do CTx and NTx play in the management of osteoporosis?
• In the urease-UV method, which product is measured during the coupling step?
• If serum protein electrophoresis shows no evidence of a monoclonal protein, what should be the next step?
• In which type of liver disease is LD expected to be most elevated?
• What is the most common timing for jaundice to first be observed in neonatal hyperbilirubinemia?
• Select the products formed from the forward reaction of ALT.
• Which component is essential in a spectrophotometer to produce a spectral absorbance curve?
• What response is expected after administration of metyrapone in normal individuals?
• How is sensitivity of a new test defined?
• In which situation is the analysis of a tumor marker most useful?
• Which marker is most sensitive for alcoholic liver disease?
• In electrophoresis, what effect can high voltage have on proteins?
• Which enzyme is activated by calcium ions?
• Which of the following amylase substrates is recommended by the IFCC?
• What caused the false elevation in ammonia levels in the provided sampling situation with a heparin lock?
• Which mechanism typically lowers oxygen affinity for hemoglobin?
• What term describes when the magnitude of error increases with increasing sample concentration?
• Which total quality management tool is used to calculate the analytical error rate in a clinical laboratory?
• For a patient with significant differences in phosphorus over two days, what would likely identify the problem?
• In which demographic group are serum ALP levels typically the highest?
• Which electrolyte is least likely to be elevated in renal failure?
• What can be inferred if a technologist reports no monoclonal bands after electrophoresis but requests a urine sample?
• Which serum protein electrophoresis result indicates an acute inflammatory process?
• What is one limitation of assessing total bilirubin in cases of hemolytic anemia?
• Which condition is characterized by metabolic acidosis with severe hypokalemia and chronic alkaline urine?
• Which factor can interfere with the measurement of LD?
• What is indicated when the y-intercept of a linear regression analysis is a measure of?
• Which statement about the EMIT assay is true?
• What is a characteristic of the Folin-Lowry method?
• What is the primary mechanism causing respiratory alkalosis?
• How do you calculate total analytical error for a sample concentration?
• Which substrate is used in the Bowers-McComb method for ALP?
• What is the primary compensatory mechanism for metabolic acidosis?
• What likely caused the abnormal hemoglobin electrophoresis results showing elevated A2 and S components?
• Which day shows a violation of the R4s QC rule in the given chart?
• What does a glycated hemoglobin test primarily indicate?
• What effect does moderate hemolysis have on bilirubin measurement using the Jendrassik-Grof method?
• A patient has an elevated serum T3 and free T4 and undetectable TSH. What is the most likely cause of these results?
• What is the best analyte to monitor for recurrence of ovarian cancer?
• What would likely cause an increase in acute phase proteins, including α1-antitrypsin?
• What ionic species is primarily detected in a coulometric chloride titration?
• What does high serum sodium levels indicate?
• Which hormone is primarily responsible for stimulating the thyroid gland?
• Which enzyme is increased in persons with prostate and small-cell lung cancer?
• What ER and PR result combination indicates the highest likelihood of response to tamoxifen?
• Which statement about steady-state drug levels is true?
• What is the recommended follow-up for women with gestational diabetes mellitus after delivery?
• Zollinger-Ellison (Z-E) syndrome is characterized by great (e.g., 20-fold) elevation of:
• Under which condition is LD most likely to be normal?
• If a blood sample is delayed for 4.5 hours, which tests could still be considered reliable?
• What is the significance of the product of individual probabilities in relation to QC control results?
• What role does apoC-II play in lipoprotein metabolism?
• A green-colored solution would show highest transmittance at:
• In patients with acromegaly, what is true about the assessment of GH levels?
• In a pregnant woman with elevated serum AFP at 12 weeks gestation, what is the appropriate follow-up?
• Which statement regarding the Philadelphia chromosome is true?
• What PCO2 value would be seen in maximally compensated metabolic acidosis?
• What is the main function of osteocalcin in bone health?
• What is the first action to take when two controls within a run are both greater than ±2s from the mean?
• What factor should be managed to ensure proper drug absorption?
• Which laboratory test would you use to confirm α1-antitrypsin deficiency in a patient?
• Based on the CK and myoglobin results, what can be best inferred from a patient in a coma due to an accident?
• Which statement regarding total and direct bilirubin levels is true?
• If the prevalence of a disease is 4.0%, how do you calculate the predictive value of a positive test result (PV+)?
• What process is most appropriate to establish a reference range for a new analyte independent of race and gender?
• What normal range for venous TCO2 should be considered concerning the reported value of 33 mmol/L?
• What type of error is suggested by the finding that triglyceride levels are abnormally high when the test follows a lipase measurement?
• Which type of bilirubin measurement method is preferred for neonates to avoid hemolysis interference?
• How many grams of CuSO4 • 5H2O are needed to prepare 1.0 L of a stock solution containing 9.6 g of copper II sulfate?
• What role does growth hormone play in glucose metabolism?
• What is the first day in the second half of the month when results should be rejected due to QC violation?
• What would indicate a need for further testing in a patient presenting with altered electrolyte balance results?
• A patient’s blood gas results are pH = 7.50, PCO2 = 55 mm Hg, HCO3 - = 40 mmol/L. These results indicate which condition?
• What is the time frame during which myoglobin becomes abnormal following an AMI?
• The ion-selective membrane used to measure potassium is composed of?
• According to the American Diabetes Association, which result is considered impaired fasting glucose?
• Which condition is commonly associated with a high level of S-type amylase?
• A patient’s blood gas results show pH = 7.26, dCO2 = 2.0 mmol/L, HCO3 - = 29 mmol/L. What is the classification of these results?
• What primary mechanism contributes to metabolic acidosis?
• Select the chemical that is used in most HPLC procedures to decrease solvent polarity.
• Which of the following markers indicate a higher relapse rate in breast cancer?
• In a nonmyocardial cause of increased serum CK-MB, what is typically observed?
• Which condition is categorized as a renal-type aminoaciduria?
• What is the pH of a solution of HNO3 if the hydrogen ion concentration is 2.5 × 10-2 M?
• Which enzyme primarily catalyzes the conversion of aspartate to oxaloacetate?
• What must be done to ensure accurate measurements of VMA in urine?
• Which condition is most likely to cause a falsely high creatinine clearance result?
• Which factor will shift the O2 dissociation curve to the left?
• Which of the following biochemical processes is promoted by insulin?
• What is the enzyme activity in international units per liter for an AST procedure, based on the change in absorbance?
• In tandem-mass spectroscopy, what is the function of the first mass filter?
• Which condition is most likely to produce elevated plasma potassium?
• In which condition is PSA least likely to be elevated?
• Which statement is accurate regarding the biuret reaction for total protein?
• Which isoenzyme of ALP migrates the farthest towards the anode at pH 8.6?
• When do troponin I and troponin T typically become abnormal following an AMI?
• Which statement best describes a nonkinetic enzyme assay?
• Which statement about phosphatases is correct?
• Which of the following statements regarding the identification of monoclonal proteins by IFE is true?
• What defect leads to elevated plasma β lipoprotein levels in familial hypercholesterolemia?
• Which statement regarding amylase methods is accurate?
• What type of ionization is primarily used in gas chromatography mass spectrometry (GC-MS)?
• What is likely to occur first in iron deficiency anemia?
• For a patient with hemolytic-uremic syndrome, which test is more appropriate than haptoglobin to assess hemolysis?
• Which condition often results in decreased albumin synthesis?
• Which factor could lead to drug toxicity even at a normally prescribed dose?
• In analyzing digoxin levels, what accounts for discrepancies in the results provided by different methodologies?
• In which scenario is the calculated oxygen saturation of hemoglobin likely to be in error?
• Which drug can increase serum bilirubin by inducing cholestasis?
• What do the admission and follow-up results indicate in a patient with a significant increase in troponin I levels?
• Which statement regarding nephelometry is correct?
• Which marker is used to monitor treatment efficacy in osteoporosis management?
• What is the relationship between creatinine levels and fetal lung maturity?
• Which combination of pH, PCO2, and bicarbonate reflects partially compensated respiratory acidosis?
• What is the primary mechanism of solute separation in HPLC with a C18 column?
• Which of the following statements regarding the diagnosis of pancreatitis is correct?
• What process is most often used in LC-MS to introduce the sample into the mass filter?
• Which blood component tends to influence the measurement of serum potassium the most?
• What is required to perform a sample blank when measuring a hemolyzed and turbid plasma sample?
• Which enzyme is most specific for β-D-glucose?
• What is the threshold critical value for low plasma potassium?
• Which of the following statements is true regarding type 2 diabetes mellitus?
• Which process contributes to the normal metabolism of bilirubin?
• What is the function of colipase in lipase assays?
• Which type of bilirubin is expected to be elevated in hemolytic conditions?
• What condition is cause for rejecting an analytical run based on quality control?
• The fragments typically produced and analyzed in methods employing mass spectroscopy are typically what?
• After staining a silica gel plate, if lipid standards migrated 1 cm faster than usual, what should the technologist do?
• Which symptom can be indicative of a primary respiratory acidosis?
• Which disturbance classification is associated with increased bicarbonate and normal PCO2?
• Which method is least affected by hemolysis?
• Which form of jaundice occurs within days of delivery and is not due to normal neonatal hyperbilirubinemia?
• Which factor contributes the most to the serum total CO2?
• In the Oliver-Rosalki method, what enzyme(s) is used in the coupling reactions to measure CK activity?
• How does a thermistor operate in a freezing point osmometer?
• What is the threshold critical value for high plasma sodium?
• Which protein is most often elevated in hypercalcemia due to malignancy?
• Why is vacuum necessary in the mass filter of a mass spectrometer?
• In a coulometric chloride titration, how is the endpoint detected?
• What does the TnI result progression indicate in a patient monitored for myocardial injury?
• What is the role of pseudocholinesterase in clinical diagnosis?
• What effect does nephrosis have on haptoglobin levels?
• Which condition will cause erroneous Cai results?
• How does familial hypercholesterolemia commonly present in patients?
• What method is ideal for analyzing serum PTH?
• In particle-enhanced turbidimetric inhibition immunoassay methods, what happens when particle-bound drug binds to antibody?
• What is the most likely reason for the abnormal rise in myoglobin levels after admission in the presence of elevated troponin and CK-MB?
• In enzymatic assays, cholesterol esterase plays what crucial role?
• Which aminoaciduria can be detected by tandem mass spectrometry in addition to phenylketonuria, maple syrup urine disease, and homocystinuria?
• Which condition would specifically increase only unconjugated bilirubin?
• Which type of monochromator produces the purest monochromatic light in the UV range?
• What is true about the measurement of urinary catecholamines?
• What component is used in a GC-MS but not in an LC-MS?
• What is the primary clinical importance of measuring LD levels?
• Which condition is associated with low serum iron and high TIBC?
• In a bias plot, what indicates that the new method is negatively biased compared to the reference?
• Why is troponin T often preferred over troponin I in certain patients?
• What is the effect of increasing solute concentration on the freezing point of a solution?
• What is the coefficient of variation for glucose with a mean of 76 mg/dL and a standard deviation of 2.3?
• What is the recommended cutoff for troponin T and I when detecting myocardial infarction?
• Which condition is associated with hypernatremia?
• What causes an increased dCO2 leading to acidosis?
• In gas chromatography, what primarily determines the elution order of volatile compounds?
• Which of the following enzymes is considered most tissue specific?
• In patients with osteoporosis, which of the following can indicate a response to bisphosphonate therapy?
• For what purpose should point-of-care whole-blood glucose methods be appropriately used?
• Which statement about TLC (Thin Layer Chromatography) for drug screening is accurate?
• Which statement regarding IFE is true?
• Which statement correctly describes the relationship between absorbance and path length in a solution?
• What stain is specifically used for lipoprotein electrophoresis?
• Why was a neonatal bilirubin assay tested with different results using two different methods?
• What type of measuring circuit is utilized in a freezing point osmometer?
• What percentage of serum calcium is ionized (Cai)?
• What does an HPLC assay for procainamide suggest if the internal standard peak for sample 1 is 15% greater than sample 2?
• Which enzyme is responsible for the conjugation of bilirubin?
• In enzymatic bilirubin assays, how are total and direct bilirubin measured?
• In clinical practice, what is a false statement about lipase?
• Which of the following is a common risk factor for developing type 2 diabetes mellitus?
• Which elimination model do drugs rapidly infused intravenously usually follow?
• In double immunodiffusion reactions, the precipitin band is:
• How soon following acute abdominal pain due to pancreatitis is the serum amylase expected to rise?
• Which method is capable of measuring both amino acids and fatty acids simultaneously?
• What is the recommended position for patients before blood collection for catecholamines?
• A flameless atomic absorption spectrophotometer uses which component to atomize a sample?
• Which characteristic is true about conjugated bilirubin?
• Which statement about iron methods is true?
• In which condition does the accumulation of phenylalanine occur due to enzyme deficiency?
• Which component is NOT required when measuring magnesium using atomic absorption spectrophotometry?
• Which assay is used to determine the risk of developing cancer?
• What coupling enzyme is used in the hexokinase method for glucose measurement?
• Which method uses the coupling enzyme G-6-PD in glucose measurement?
• What component is not needed in a chemiluminescent immunoassay analyzer?
• What is affected in prerenal failure that leads to increased BUN levels?
• Which condition is known to increase total T4 by raising TBG levels?
• If one of two controls within a run is above +2s and the other is below -2s, what does this indicate?
• What is the normal ratio of bicarbonate to dissolved carbon dioxide (HCO3- : dCO2) in arterial blood?
• What is the primary purpose of therapeutic drug monitoring?
• Which statement about ALT and AST is true?
• What is the common effect of hemolysis on AST and ALT assays?
• Which condition primarily affects potassium levels in the blood?
• Which cancer type is associated with significantly elevated levels of AFP?
• What does a high anion gap indicate in clinical practice?
• Which of the following conditions is associated with hypophosphatemia?
• Which substance generates the light signal in electrochemiluminescence?
• What component is essential for a thermal cycler to amplify DNA?
• What is the purpose of performing a single-point calibration between each blood gas sample?
• Which statement about LD measurement methods is accurate?
• What does a decreased PCO2 indicate in a patient with uncompensated respiratory alkalosis?
• Which hemoglobin is expected to migrate furthest toward the cathode in an acid buffer?
• In the context of renal function, what does the term GFR stand for?
• What can explain low serum calcium and PTH levels in a renal dialysis patient?
• What can affect the levels of total T3 and T4 in the body?
• Which statement accurately describes bilirubin metabolism?
• Which reagent is used in the direct HDL cholesterol method?
• What does the term pharmacokinetics refer to?
• For what purpose do many optical systems in chemistry analyzers utilize a reference light path?
• What is the main purpose of the collision chamber in tandem mass spectrometry?
• What situation allows reporting a chromatogram in the presence of hemoglobin C and F?
• At what pH does normal arterial blood typically maintain?
• Why is olive oil used as a substrate in the reference method for lipase?
• What is true regarding the measurement of carboxyhemoglobin?
• If a patient's hCG level increases post-chemotherapy, what does this likely indicate?
• When calibrating a pH meter and experiencing unstable readings, what is the recommended action?
• What is the secondary enzymatic reaction coupled to the urease reaction in the ultraviolet enzymatic method for BUN?
• Which color of light corresponds to the shortest wavelength that a green solution might absorb?
• Which method can reduce matrix effects during atomic absorption analysis?
• What effect results from exposing a normal arterial blood sample to room air?
• Which enzyme enables the measurement of creatinine through a coupled reaction with peroxidase?
• Which test is considered the most widely used screening method for Cushing's syndrome?
• What should be done if all hemoglobins have greater anodal mobility than usual but the current reading is too low?
• What characteristic is typical for the serum bilirubin levels in neonates during the first week after birth?
• What is the function of HDL in lipid metabolism?
• Which type of hCG test is most useful for diagnosing testicular cancer?
• Which tumor marker is associated with cancer of the urinary bladder?
• Which thyroid hormone is approximately 10 times more active than the other?
• What is the expected pH change in relation to body temperature above 37°C?
• Which electrochemical method can also be utilized to measure glucose in plasma alongside polarography?
• In polarography, what is the minimum voltage needed to cause reduction of metal ions called?
• Which method is best for quantitatively determining Hgb A2 and Hgb F?
• What reflects the extent of glucose regulation over the 8- to 12-week interval prior to sampling?
• What is the minimum requirement for QC of a total protein assay within a 24-hour period?
• Which tumor marker is used to monitor persons with breast cancer for recurrence of disease?
• Which type of acid-base disturbance is primarily caused by renal failure?
• What does Beer's law state about the relationship between absorbance and concentration?
• Which plot is recognized for detecting all types of QC errors?
• A serum ALP level greater than twice the elevation of GGT suggests:
• What type of tube should be used to measure trace metals in blood other than lead?
• Which trace element is recognized as an essential micronutrient?
• What is a common source of error when measuring creatinine levels using the Jaffe method?
• What is the LD pleural fluid:serum ratio for a transudative fluid?
• In terms of pH extraction for drugs, what is an essential concept in maximizing recovery in an anion exchange column?
• Which condition is most consistently associated with hyperparathyroidism?
• What parameter generally determines the acceptable range for quality control results?
• To calculate a patient's non-HDL cholesterol level, which fractions should be measured?
• Which measurement principle is applied in a vapor pressure osmometer?
• In chemiluminescent assays, what is the primary purpose of the light emitted?
• What does the abbreviation 'HPLC' stand for in chemical analysis?
• Which characteristic is associated with obstructive jaundice?
• How many grams of sodium hydroxide (NaOH) are required to prepare 150.0 mL of a 5.0% w/v solution?
• Which of the following conditions could elevate serum phosphorus levels?
• What type of detector is typically used in high-performance liquid chromatography with electrochemical detection (HPLC-ECD)?
• Which analyte should be reported as a ratio relative to creatinine concentration?
• Which condition is NOT typically associated with elevated ALT levels?
• What is the reference range for arterial blood pH?
• What does a standard error of estimate indicate in linear regression analysis?
• Which protein migrates in the β region at pH 8.6?
• Which situation is likely to cause an error when using an electronic analytical balance?
• What hormone levels provide a typical profile in patients presenting with polycystic ovarian syndrome?
• What type of QC problem is indicated by six consecutive control results showing the same trend?
• The EMIT test for drugs of abuse employs which component?
• For a patient suspected of ectopic ACTH production, which test is most useful in substantiating this diagnosis?
• In enzyme activity, what is the significance of a reaction achieving zero-order conditions?
• What is the most likely cause of loss of linearity in absorbance readings at high analyte concentrations in a spectrophotometer?
• What is a possible reason for the differing bilirubin mean values between two laboratories using the same analysis method?
• Which variable can impact the clearance and efficacy of a drug?
• What does a reagent blank correct for in a spectrophotometric measurement?
• Which condition can lead to the increased risk of osteoporosis if vitamin D levels are deficient?
• Which statement regarding creatinine is true?
• What role do cofactors play in enzymatic reactions?
• How is the CK relative index (CKI) calculated?
• Which statement best describes the relationship between luteinizing hormone (LH) and follicle-stimulating hormone (FSH) before ovulation?
• Which type of lipoprotein is primarily formed from the remnants of chylomicrons?
• Which light source is commonly used in a nephelometer?
• What is the primary limitation of the biuret reagent?
• What is the purpose of adding adenosine monophosphate (AMP) in the Oliver-Rosalki method?
• Pharmacogenomics mainly involves which of the following testing types?
• What is one effect of administration of albumin on serum albumin levels?
• In the diagnosis of menopause, what relationship is observed between estrogen and FSH levels?
• In the context of blood ammonia evaluation, what substance should be avoided in the collection tube?
• Convert 2.0 mEq/L of magnesium to milligrams per deciliter. What is the result?
• In which condition would serum lactate dehydrogenase be highest?
• Which method is recognized as the reference method for measuring serum glucose?
• In a follow-up testing for a patient on thyroxine, an elevated TSH with normal free T4 suggests which situation?
• Regarding drugs with first-order elimination, which statement is true about drug clearance?
• What impact does stray light have on high-concentration spectrophotometric measurements?
• In uncompensated metabolic acidosis, which value remains normal?
• What advantage do ion selective analyzers using undiluted samples have?
• In a lipid profile test, what should be considered when calculating the cholesterol concentration?
• Which of the following conditions causes a decrease in serum sodium levels?
• What does a high correlation coefficient in a linear regression analysis suggest about two methods?
• What is the goal of the saponification step in the Abell-Kendall method for cholesterol measurement?
• What elimination model best describes most oral drugs?
• Which hormone increase is most frequently responsible for decreased estrogen production due to pituitary adenoma?
• What indicates a problem with hourly taken glucose levels in diabetes monitoring?
• Which condition is associated with respiratory alkalosis?
• Calculate the pH of a solution of 1.5 × 10-5 M NH4OH. What is the result?
• Which of the following is a key product of the reaction facilitated by AST?
• Which condition results in a decreased PAO2-PaO2 difference?
• When establishing quality control limits, which practice is considered inappropriate?
• What is the most likely explanation if a peak blood level for theophylline is lower than the therapeutic range?
• Urinary urea measurements can be used to calculate which of the following?
• What hormonal changes generally characterize the onset of menopause?
• What is a common potential source of error in the hexokinase method?
• Which condition is primarily caused by a deficiency in renal cells of 1-α-hydroxylase?
• In a patient who has an EKG showing no ST segment elevation with increasing troponin levels, what is the most likely interpretation?
• Which reagent is necessary for measuring lead in whole blood using atomic absorption spectrophotometry?
• Which buffer system is most effective in blood?
• What does high plasma levels of homocysteine indicate?
• In the liver, bilirubin is conjugated by addition of?
• Which bilirubin measurement technique can cause elevated results due to light absorption by blood components?
• What laboratory result is commonly associated with cystic fibrosis?
• If a patient has elevated levels of HVA and VMA, which condition is most likely?
• What is the most accurate formula for predicting plasma osmolality?
• What is the significance of a result of 6.5% or more in a glycated hemoglobin test?
• Which enzyme is used to measure plasma or serum salicylate?
• What pH adjustment enhances the extraction of an acidic drug with a pKa of 6.5 from urine?
• When should progesterone be measured to evaluate anovulation in adult females?
• Which set of results indicates uncompensated respiratory alkalosis?
• Which electrolyte measurement is least affected by hemolysis?
• Which statement regarding reflectometry is considered true?
• What is the maximum recommended storage time and temperature for an arterial blood gas sample drawn in a plastic syringe?
• Given a serum-based cholesterol standard of 200.0 mg/dL, what is the concentration of cholesterol in a patient's sample with absorbance results?
• Which statement is true regarding heparin as an anticoagulant for blood gas studies?
• In high-performance liquid chromatography (HPLC), what does the term isocratic refer to?
• Which condition is most frequently associated with secondary hypercholesterolemia?
• What is the most appropriate course of action when a lipemic sample gives varying sodium results based on dilution methods?
• Which enzyme is measured in whole blood?
• What causes the cathodal movement of γ globulins at pH 8.6?
• In peroxidase-coupled glucose methods, which reagent interacts with the chromogen during the coupling step?
• On which principle does the biuret method operate?
• What is true regarding the Jendrassik-Grof method for measuring bilirubin?
• What is affected by diminished renal excretion related to uric acid?
• Which type of mass spectrometer primarily uses a quadrapole as the first mass filter?
• What is the primary reagent used in the Jaffe method for measuring creatinine?
• What type of plot is best for comparing precision and accuracy among laboratories?
• Why would correcting for quality control limits be important in a laboratory testing environment?
• Calcium is physiologically active in which form?
• Select the five pharmacological parameters critical to serum drug concentration.
• How is the threshold cycle in a real-time PCR amplification curve determined?
• Which process best describes enzyme saturation?
• What is the calculated bias of Method y compared to Method x?
• What does the term R4S indicate in quality control?
• What characteristic does glucose oxidase have in terms of specificity?
• Which of the following is a characteristic of type 1 diabetes mellitus?
• Which of the following is a marker for bone formation?
• Why is Cystatin C preferred over creatinine in some assessments of renal function?
• What is a common result of metabolic alkalosis related to chloride levels?
• What is the primary purpose of measuring trough levels for a drug?
• What method is most useful for detecting sample misidentification?
• Which aminoaciduria is associated with the overflow of branched chain amino acids?
• In a situation where serum iron is low and the percent saturation is only 10%, what is the implication?
• In a patient’s biochemistry results, if the sodium level is significantly low while other levels are normal, what should be reported?
• What type of aminoaciduria is characterized by excess amino acids due to defective renal tubular transport?
• Which formula correctly describes the relationship between absorbance and %T?
• Under which condition is a validation study required?
• What would be the result of direct measurement of hydrogen ions concentration in terms of pH?
• Which cardiac marker is consistently elevated in individuals with unstable angina?
• A solution that has a transmittance of 1.0 %T would have an absorbance of:
• Which of the following is true regarding ALP isoenzymes?
• In gel electrophoresis at pH 8.6, which lipoprotein has the highest migration rate?
• Which of the following tumor markers is classified as a tumor suppressor gene?
• Which cardiac marker derived from neutrophils is associated with an increased risk of myocardial infarction?
• In HPLC, what does the term reverse phase indicate about the mobile phase?
• What could lead to erroneous measurement of calcium if blood is collected in a specific anticoagulant?
• How is magnesium interference avoided when measuring calcium with o-cresolphthalein complexone?
• What is the PCO2 if the dissolved carbon dioxide (dCO2) is 1.8 mmol/L?
• What is the equivalent weight of HNO3?
• Which plot provides the earliest indication of a shift or trend in quality control results?
• In suspected cases of Wilson's disease, what are the expected laboratory findings?
• During early pregnancy, what hormone stimulates the thyroid, leading to increased levels of free thyroid hormones?
• What is the typical range of temperature required for annealing in PCR?
• What could most likely cause broad trailing peaks in a GC chromatogram for blood alcohol?
• What is the significance of pKa in buffer solution calculations?
• Which hormone is primarily involved in the regulation of sodium balance and blood pressure?
• The polarographic method for glucose measurement is based on which principle?
• What happens to free T3 levels in primary hyperthyroidism?
• Which QC issue occurs when six consecutive results are on the same side of the mean?
• Which of the following diseases leads to high total iron-binding capacity?
• Which protein class primarily composes the α2-fraction in serum protein electrophoresis?
• Which of the following tests is consistently abnormal in osteoporosis?
• Which of the following statements regarding paraproteins is true?
• Why is creatinine considered the substance of choice for measuring endogenous renal clearance?
• Which metabolite is primarily measured to detect neuroblastoma?
• What is the function of the nebulizer in an atomic absorption spectrophotometer that uses a flame?
• Which laboratory test is considered a marker for ischemic heart disease?
• What condition is indicated by elevated blood ammonia levels?
• From what process is creatinine primarily formed?
• Which condition is typically associated with an acute inflammatory pattern?
• In which scenario can both metabolic and respiratory alkalosis occur?
• Which quality control (QC) rule would be broken 1 out of 20 times by chance alone?
• Which disease is classified as a mucopolysaccharide storage disease?
• High serum total protein but low albumin is typically associated with what condition?
• What whole-blood lead level indicates excessive exposure in children?
• What action should have been taken before repeating controls after a quality control error was detected?
• Which of the following conditions is associated with hypokalemia?
• What will typically happen in metabolic alkalosis regarding potassium levels?
• Which statement best describes immunofixation electrophoresis (IEF)?
• What enzyme deficiency is responsible for type 1 glycogen storage disease?
• What is the normal range for partial pressure of carbon dioxide (PCO2) in arterial blood?
• The syndrome of inappropriate antidiuretic hormone secretion (SIADH) causes:
• Which of the following proteins has the highest isoelectric point (pI)?
• Which of the following is a common characteristic of γ-globulins?
• Which of the following is NOT a requirement for quality control (QC) materials?
• What is the primary characteristic of polyacrylamide gel electrophoresis (PAGE)?
• Among the listed protein methods, which has the highest analytical sensitivity?
• Which condition is most often associated with a high serum iron level?
• How is reactive hypoglycemia typically characterized?
• In which condition is the plasma or 24-hour urinary cortisol inconsistent with the clinical picture?
• In absorption spectrophotometry, which statement is true?
• What is the result of a high volume of distribution (Vd)?
• How does the detection duration of marijuana compare to other substances?
• Which statement accurately describes serum transaminase levels in acute myocardial infarction (AMI)?
• A serum thyroid panel reveals an increase in total T4, normal TSH, and normal free T4. What is the most likely cause of these results?
• How does Hgb C migrate in relation to Hgb A during electrophoresis on citrate agar?
• Which substance is measured as an alternative to creatinine for evaluating GFR?
• Which test can confirm a diagnosis of Cushing's disease after initial suspicion?
• Which factor can lead to a trend in quality control results?
• Which equation represents the Henderson-Hasselbalch equation as applied to blood pH?
• What is the molecular weight of CuSO4?
• What is the correct timing for collecting blood sample for peak drug levels?
• What constitutes the indicator reaction in the glucose oxidase method?
• What condition is most likely to cause hyperalbuminemia?
• What is the most abundant corticosteroid hormone secreted by the adrenal cortex?
• What condition is diagnosed using the D-xylose absorption test?
• What is the primary purpose of the Nernst equation in polarography?
• What laboratory test becomes abnormal at the earliest stage of acute coronary syndrome?
• What is the most specific test for establishing a diagnosis of Cushing's disease?
• Which of the following is a common cause of pseudohyponatremia?
• What is the purpose of LD in the kinetic method of Henry for AST?
• What is the clinical utility of B-type natriuretic peptide (BNP) in diagnosing heart conditions?
• What is the EC number classification for CK?
• Which instrument requires a primary and secondary monochromator for its operation?
• What effect does hemolysis have on glucose measurement in the hexokinase method?
• What is the best preservation method for twenty-four-hour urine samples for catecholamines?
• In liver disease, what is a common result regarding bilirubin metabolism?
• Which method is most commonly used for lipase assay?
• Which route of drug administration is associated with 100% bioavailability?
• What is the substance used in ICP ionization to create a hot plasma?
• Which of the statements below regarding the methods of Henry for AST and ALT is correct?
• Which lipoprotein fraction is associated with the pre-β zone during ultracentrifugation?
• What can cause hypervolemia associated with total body sodium excess?
• Which condition will lead to erroneous results when preparing for an oral glucose tolerance test (OGTT)?
• Which condition is commonly associated with hyperuricemia?
• Which dye is known for being the most specific for measuring albumin?
• What is the pH of a 0.05 M solution of acetic acid, given that Ka = 1.75 × 10-5?
• In thin-layer chromatography (TLC), what is the term for the distance the solute migrates divided by the distance the solvent migrates?
• What is the most appropriate single screening test for thyroid disease?
• What is the effect of viscosity differences when performing atomic absorption spectrophotometry?
• How can interference from reducing substances in the Jaffe reaction be partially mitigated?
• What is the best method to determine hemoglobin oxygen saturation?
• What is the purpose of an internal standard in HPLC and GC methods?
• What mechanism causes Cushing's disease?
• What is the relevance of using the CA-19-9 marker?
• Select the products formed from the forward reaction of AST.
• What is the correct formula for creatinine clearance?
• What is the primary variable that affects blood pH?
• Which statement about lipase specificity is true?
• What does a decrease in serum ferritin levels typically indicate?
• Which anticoagulant is preferred for blood gas studies?
• Which condition is usually associated with elevated levels of both AST and ALT?
• What is the sample of choice for lead screening?
• What does distribution refer to in pharmacology?
• Which Hgb is a β-δ chain hybrid that behaves similarly to Hgb S at pH 8.6?
• What is the correct order of Hgb migration on agarose or cellulose acetate at pH 8.6?
• Which process is appropriate for detecting the hook effect in a case of suspected molar pregnancy?
• What does δ-bilirubin refer to?
• Which enzyme is classified as a transferase?
• When should blood samples for trough drug levels be collected?
• What is the role of a mass filter in mass spectrometry?
• If a patient has elevated levels of triglycerides and high amylase, what might this indicate?
• What is the relationship between temperature and fluorescence in fluorometric measurements?
• What can elevated ALP with increased GGT suggest?
• What must be included in calculations for the next month's QC limits?
• What is a common use of potassium dichromate solutions in spectrophotometry?
• A female showing severe hirsutism should be tested for which hormones?
• Which statement regarding serum total protein and albumin levels is true?
• Urea is produced from the catabolism of which substances?
• Which chemical forms a thermostable bond with calcium, causing chemical interference in atomic absorption?
• Which reagent is used in thin-layer chromatography (TLC) to extract cocaine metabolites from urine?
• In an adult male with primary testicular failure, what is the expected hormone profile?
• Which condition is least likely to be associated with increased serum ALP?
• In cerebrospinal fluid (CSF), which level of glucose is indicative of septic meningitis and other serious conditions?
• Which factor can interfere with glucose measurements when using the glucose dehydrogenase method?
• In which state can iron be transported by transferrin?
• What type of drugs can affect catecholamine measurements in the body?
• Which condition is commonly associated with elevated prolactin levels?
• What characteristic differentiates cardiac-specific troponins from total CK in diagnosing AMI?
• When is CK-MB typically elevated compared to myoglobin during an AMI?
• In which condition is the measurement of acid phosphatase clinically useful?
• When encountering a patient with a sodium level of 130 mmol/L, what is the most appropriate next step assuming quality control is acceptable?
• Which test is most helpful in identifying acute toxicology in emergency situations?
• What is the expected response to ACTH stimulation in patients with primary Addison's disease?
• What method is employed for measuring iron or lead by plating and oxidizing it?
• For a plasma lithium level measured at 14.0 mmol/L, what action should be taken?
• What component is crucial to ensure accurate readouts in spectrophotometry?
• Which of the following often leads to toxicity when a drug level is within the therapeutic range?
• In which case would eGFR from plasma creatinine be more accurate than plasma cystatin C?
• For which of the following drugs would peak levels be most critical to monitor?
• Which statement accurately reflects the coulometric titration of chloride?
• A patient has high plasma myoglobin but normal troponin I levels. What is the most likely condition?
• Which statement about the volume of distribution (Vd) of a drug is accurate?
• How does increased renal function affect drug levels?
• What effect does one mole per kilogram H2O of any solute have on vapor pressure?
• What is a common cause of stray light?
• What common characteristic do "direct" methods for LDL cholesterol assay share?
• Which of the following amino acids is a precursor for thyroid hormones?
• What does fructosamine provide information about?
• What is the significance of the LD-4 and LD-5 isoenzymes in liver disease?
• What is the primary function of measuring both CK-MB and myoglobin in potential AMI cases?
• What product is formed when bilirubin is reduced by intestinal bacteria?
• Regarding CEDIA, which statement is correct?
• What is the most probable explanation for a patient's glucose level soaring to 1,100 mg/dL alongside elevated sodium and potassium levels?
• What screening test is recommended for colorectal cancer in individuals over 50?
• In which case might a very low plasma TSH result not correlate with thyroid status?
• What is the most common cause of persistent noise from an ion-selective electrode?
• Which disorder is primarily linked to lactate acidosis?
• In evaluating a new test, which reflects a significant bias caused by constant error?
• Which enzyme's activity can show false elevations due to dilution in samples?
• Which test is most useful for evaluating protein deficiencies due to malnutrition?
• If a blood sample is found alkaline with low PCO2, how should that be interpreted?
• What happens to transferrin saturation in iron deficiency anemia?
• What is the most likely explanation for the low serum calcium results in a red-stoppered tube?
• Which of the following statements is true regarding reverse T3 (rT3)?
• What should be done if a drug leads to narrow therapeutic range and toxicity increases?
• Which of the following statements about carbohydrate intolerance is true?
• What is the appropriate adult reference range for fasting blood glucose?
• Which method is used to introduce the sample into a mass spectrometer for trace element analysis?
• A trend in quality control results is most likely caused by which factor?
• The phrase "first-pass hepatic metabolism" refers to:
• Which condition might show a significant increase in aldolase?
• In the Henderson-Hasselbalch expression, what does the value 6.1 represent?
• What is a potential source of error in the colorimetric method for measuring Pi?
• After a child on phenytoin shows signs of toxicity, what is the recommended next step?
• Which hormone is responsible for the reabsorption of water in the kidneys?
• What is the function of a serum blank in biochemical testing?
• What typically causes anovulation when influenced by high levels of prolactin?
• When the total CK is reported at 480 IU/L, what does a CK-MB level of 8 µg/L indicate?
• What is the expected hormone level profile in a female with hypogonadotropic ovarian failure?
• Which factor leads to lower sodium results in lipemic samples?
• Lipoprotein(a), or Lp(a), is an important indicator in serum because it is what?
• If a urine glucose result is 160 mg/dL by one method and 240 mg/dL by another method the next day, what is likely causing this discrepancy?
• What condition is linked to hyponatremia?
• Which component is essential for determining protein intake when evaluating nitrogen balance?
• Which factor is most likely to cause a falsely low result when using the BCG dye-binding assay?
• Which of the following statements regarding the naming of transaminases is true?
• Which laboratory technique is considered the gold standard for definitive drug testing?
• What primarily contributes to elevated serum enzymes in cholestatic liver disease?
• Which lipoprotein is primarily responsible for transporting endogenous triglycerides?
• Which statement about multiple endocrine neoplasia (MEN) is true?
• Which condition could lead to an increased level of plasma creatinine?
• Which test is not useful for diagnosing iron deficiency when given an iron profile with normal results?
• Which tumor marker is used to determine the usefulness of trastuzumab (Herceptin) therapy for breast cancer?
• Which glucose measurement method is susceptible to falsely low results due to ascorbate interference?
• What is a common indicator of primary ovarian insufficiency?
• What is an advantage of high-resolution agarose electrophoresis over lower-current electrophoresis?
• What does an international unit (IU) of enzyme activity measure?
• What is the most likely reason for high creatinine levels in amniotic fluid collected from a patient with hemolytic disease of the newborn?
• What is the PO2 of calibration gas containing 20.0% O2 when the barometric pressure is 30 in.?
• Which set of laboratory results is indicative of a patient who has suffered an acute myocardial infarction?
• What component of a freezing point osmometer is responsible for measuring the sample temperature?
• Which substance is used to activate CK in the assay?
• How many milliliters of a 2,000.0 mg/dL glucose stock solution are needed to prepare 100.0 mL of a 150.0 mg/dL glucose working standard?
• What is the mechanism by which ammonia accumulates in cases of hepatic coma?
• Along with sodium bicarbonate, what substance contributes significantly to the base amount in the blood?
• Which statement about TSH and T4 in early pregnancy is correct?
• A patient has a pH of 7.56 and a PCO2 of 25 mm Hg. What is the most likely cause of these results?
• Which type of dietary fatty acid does NOT increase serum LDL cholesterol production?
• Light scattering when the wavelength is greater than ten times the particle diameter is described by which law?
• What is the role of alkaline dithionite in measuring carboxyhemoglobin?
• Which of the following statements about fluorometry is true?
• What is the basis of Kjeldahl's procedure for measuring total protein?
• What action should be taken when three consecutive patients show consistently elevated BUN results without other evidence?
• Which isoenzyme of ALP is most heat-stable?
• Which of the following statements regarding the metabolism of bilirubin is true?
• BUN is determined electrochemically by coupling the urease reaction to what measurement?
• For a drug following first-order pharmacokinetics, what formula is used to adjust dosage for desired blood levels?
• Which condition will prevent any migration of proteins across an electrophoretic support medium?
• How should QC results for uric acid measurements be reported?
• Which liver disease is associated with the highest levels of transaminases?
• What is a common cause of increased TBG levels in the body?
• Which of the following is the most accurate measurement of Pi in serum?
• What is the significance of the bioavailable fraction (f) in pharmacokinetics?
• What is the normal difference between alveolar and arterial PO2?
• Which instrument can be assumed to have the narrower bandpass?
• In atomic absorption spectrophotometry, what is the role of a monochromator?
• Regarding myoglobin's clinical utility, which statement is correct?
• What is the purpose of adding SDS in polyacrylamide gel electrophoresis?
• Which enzyme deficiency is responsible for phenylketonuria (PKU)?
• Which hormone is primarily responsible for the suppression of the hypothalamic-pituitary-gonadal (HPG) axis in cases of increased prolactin?
• What is the blood pH when the partial pressure of carbon dioxide (PCO2) is 60 mm Hg and the bicarbonate concentration is 18 mmol/L?
• Which support medium is used to determine the molecular weight of a protein?
• Which drug group typically requires both peak and trough measurements?
• What method is considered the reference for serum lipase?
• Which method is recognized as the reference method for HDL cholesterol?
• What might explain an intermittent spike in triglycerides after testing for lipase in a chemistry profile?
• How does the iron absorption process change when iron is in the oxidized state?
• In which situation is qualitative analysis of a drug generally sufficient?
• What process is described when parent ions are bombarded to form daughter ions in mass spectrometry?
• Which statement regarding the diagnosis of Addison's disease is accurate?
• Why are three levels used for quality control of pH and blood gases?
• What is the function of a sharp cutoff filter in spectrophotometry?
• Which instrument is known to require a highly regulated DC power supply?
• Which characteristic is essential for a good screening test?
• In cases of suspected ethylene glycol intoxication, which result is likely to be abnormal?
• What monochromator specification is needed to measure the true absorbance of a compound having a natural absorption bandwidth of 30 nm?
• Which statement regarding total CK levels is accurate?
• What is the most common cause of Cushing's syndrome?
• Which statement regarding electrolytes is accurate?
• What causes a "response" error from an ion-selective electrode for sodium when measuring serum?
• Which enzyme is least useful for differentiating necrotic from obstructive jaundice?
• What role does vitamin D measurement play in the management of osteoporosis?
• Which of the following statements about aminotransferases (AST and ALT) is true?
• What factor can affect the accuracy of whole-blood glucose monitoring?
• Which of the following statements regarding the TIBC assay is correct?
• What is the best course of action if a technologist needs to perform a stat ionized calcium assay but the serum is older than three hours?
• Which condition is most likely to cause interlaboratory variation in bilirubin results?
• Which condition is associated with low serum magnesium?
• Which electrolyte level correlates best with plasma osmolality?
• What is a true statement regarding urobilinogen?
• Which action could lead to analytical error in a sweat chloride collection?
• The primary wavelength in bichromatic measurement is typically located at what characteristic region?
• Which formula provides the best estimate of serum TIBC?
• In mass spectroscopy, the term base peak typically refers to what?
• In which condition is serum TSH level almost absent?
• What would be the expected PSA result 1 month after successful prostatectomy in a patient with initial PSA of 10.0 ng/mL?
• Which of the following conditions is characterized by high levels of urinary metanephrines?
• To estimate the dosage needed for a desired steady-state blood level, which formula is used?
• What is the primary purpose of a chopper in atomic absorption spectrophotometry?
• Which statement best describes testing recommendations for vitamin D?
• The electrophoretic pattern indicating a marked decrease in α1-globulin likely suggests which deficiency?
• What is the main advantage of capillary electrophoresis over agarose gel electrophoresis?
• How does the body primarily compensate for metabolic acidosis?
• What does a base peak at 16 in a GC-MS analysis indicate?
• What do abnormal serum osmolality results suggest about a patient with an elevated osmolal gap?
• What does a slope exceeding 45° on a Cusum plot indicate?
• Which of the following tests is considered least essential in an emergency department?
• How many milliliters of HNO3 are needed to prepare 1.0 L of a 2.0 N solution?
• What is the best course of action for a 2-hour-old citrated blood sample that is slightly hemolyzed?
• Which specimen is most appropriate for an initial investigation when drug toxicity is suspected?
• What is the primary substrate for the enzyme ALT?
• In which liver disease is the DeRitis ratio (ALT:AST) usually greater than 1.0?
• What is the most likely reason for a patient's arterial blood gas results showing a pH of 7.54 and a PCO2 of 18.5 mm Hg?
• Which test is the most useful way to evaluate the response to treatment for multiple myeloma?
• How does the use of a reference beam improve spectrophotometric measurements?
• Which finding is characteristic of all forms of clinical hypoglycemia?
• What is the significance of uric acid levels above 10 mg/dL?
• In the Nernst equation, what does the term RT/nF represent?
• Which condition is characterized by primary hyperaldosteronism due to adrenal tumors or hyperplasia?
• Which abnormal type of Hgb migrates to the same position as Hgb S?
• What is the principal cause of low serum iron and high total iron-binding capacity?
• How frequently would two consecutive controls being beyond -2s from the mean occur on the basis of chance alone?
• What is commonly used to adjust the pH during the preparation of samples for chromatography?
• How many significant figures should be reported when the pH of a 0.060 M solution of nitric acid is calculated?
• What is the recommended cutoff for early detection of chronic kidney disease in diabetics using the test for microalbuminuria?
• What is the significance of a narrowed bandpass in spectrophotometry?
• If too small a peak-trough difference is seen for a drug given orally, what should be done?
• Which of the following buffers is used in the IFCC recommended method for ALP?
• What is true about synthetic substrates in amylase assays?
• Which factor best explains the discrepancy between a high digoxin level and a normal clinical status?
• In diagnosing Wilson's disease, which serum protein should be measured?
• What concentration gives the highest sensitivity with the least number of unnecessary biopsies in a prostate cancer screening test?
• Which of the following laboratory results is consistent with primary hypoparathyroidism?
• Which type of electrode is considered a current-producing electrode?
• What effect does low hematocrit have on whole-blood glucose monitoring?
• In nephelometry, what is the relationship between detector response and concentration?
• Select the correct order of hemoglobin migration on citrate agar at pH 6.2.
• Which abnormal laboratory result is typically found in von Gierke's disease?
• What is needed alongside true negatives to calculate specificity of a laboratory test?
• What level of troponin I is typically considered abnormal and indicates potential cardiac damage?
• When an amylase result is 550 U/L and a 1:4 dilution gives 180 U/L, what should the technologist report?
• Which of the following processes occurs in the liver during drug metabolism?
• Which condition gives rise to the highest serum level of transaminases?
• What adjustment is needed for pH correction in a patient with a body temperature of 38°C?
• What would be cause for rejecting a urine sample for drug of abuse screening?
• What effect does prolonged storage have on arterial blood gas results?
• What is the principle of the transcutaneous bilirubin assay?
• What is the most effective sampling schedule for ruling out AMI using both myoglobin and troponins?
• Which enzyme is primarily responsible for the phosphorylation of glucose in the CK assay?
• What impact does lead exposure have on children compared to adults?
• What should be done next after finding that total protein levels are abnormal while other biochemistry test results are normal?
• Which statement about the measurement of ammonia concentration is correct?
• What action should be taken if a glycated Hgb result is inconsistent with a fasting glucose result?
• In familial β dyslipoproteinemia, which lipoprotein accumulates in the plasma?
• Which statement about ammonia is accurate?
• Which hemoglobin separates from Hgb S on citrate agar, but not on agarose or cellulose acetate?
• What is indicated by a slight decrease in albumin with an increase in the α2-fraction in serum protein electrophoresis?
• What effect does increased estrogen during pregnancy have on TBG levels?
• Which condition is associated with the phenomenon of "β-γ bridging"?
• A specimen that gives an error flag indicating substrate depletion is most likely due to which factor after dilution?
• What is the primary clinical use of assessing serum prealbumin levels?
• Which condition is typically associated with total body sodium excess?
• Select the hormone which when elevated is associated with galactorrhea, pituitary adenoma, and amenorrhea.
• What factors influence an enzyme's activity?
• Which uric acid measurement method is known to have negative bias from reducing agents?
• Which photodetector is most sensitive to low levels of light?
• In a patient with SIADH, what would you expect to find regarding urine osmolality?
• Which apoprotein is inversely correlated with the risk of coronary heart disease?
• Which enzyme is usually decreased in liver disease?
• What test is primarily used to differentiate Cushing's disease from Cushing's syndrome caused by adrenal tumors?
• What value is needed to determine the threshold in real-time PCR?
• Which statement about adrenal cortical dysfunction is correct?
• Which marker is significant for diagnosing testicular cancer in males?
• When should controls be used in a laboratory to ensure accuracy?
• Which equation describes the potential that develops at the surface of an ion-selective electrode?
• What does an enzyme do to the activation energy of a reaction?
• What is the American Diabetes Association recommended cutoff value for adequate control of blood glucose in diabetics as measured by glycated hemoglobin?
• What do you multiply by to convert from milligrams per deciliter to millimoles per liter?
• What may cause a rise in serum conjugated bilirubin during hepatitis?
• At pH 8.6, proteins are _________ charged and migrate toward the _________.
• Which hyperbilirubinemia form is caused by an inherited absence of UDP-glucuronyl transferase?
• How many milliliters of glacial acetic acid are needed to prepare 2.0 L of a 10.0% v/v acetic acid?
• A plasma myoglobin result of 10 µg/L indicates what when the following measurements also fall within normal limits?
• By which process is urea formed from ammonia in the liver?
• Point-of-care tests (POCT) for whole-blood glucose monitoring primarily utilize which detection method?
• A patient's BUN is 60 mg/dL and serum creatinine is 3.0 mg/dL. What do these results suggest?
• What is the average weight of deionized water transferred when calibrating a pipet with a fixed delivery of 10.0 µL?
• Which of the following hemoglobins migrates to the same position as Hgb S on agarose?
• Select the coupling enzyme used in the kinetic AST reaction of Henry.
• How should LDL cholesterol be determined for a lipemic specimen with specific lipid levels?
• Which of the following hormones is often decreased by approximately 25% in the serum of pregnant women who have a fetus with Down syndrome?
• What is the relationship between an apoenzyme and a prosthetic group?
• In an iron profile with low serum iron, normal ferritin, and elevated TIBC, what does this indicate?
• Which analyte has the poorest precision given the following data?
• Which condition is most commonly linked to elevated total protein levels?