What is true regarding the measurement of carboxyhemoglobin?

In the context of measuring carboxyhemoglobin, the statement that bichromatic analysis is required to eliminate interference by oxyhemoglobin is accurate. Carboxyhemoglobin, formed when carbon monoxide binds to hemoglobin, can be measured spectrophotometrically. One challenge in this measurement is that oxyhemoglobin and carboxyhemoglobin have overlapping absorbance spectra, particularly in the visible range.

Bichromatic analysis utilizes two wavelengths, one where oxyhemoglobin absorbs light and another where carboxyhemoglobin absorbs light. By comparing absorbance at these two specific wavelengths, it is possible to reduce the interference caused by the presence of oxyhemoglobin, allowing for a more accurate measurement of carboxyhemoglobin levels.

This method is particularly important in clinical settings to provide accurate assessments of carbon monoxide exposure and potential poisoning, as differentiating between oxyhemoglobin and carboxyhemoglobin is essential for effective patient management.