Which test is not primarily used for detecting myocardial infarction?

The test that is not primarily used for detecting myocardial infarction is albumin cobalt binding. This assay is primarily utilized to assess the binding properties of certain substances with albumin, rather than diagnosing conditions related to heart function or cardiac muscle damage.

Troponins, CK-MB, and myoglobin are all cardiac markers commonly employed in the diagnosis of myocardial infarction. Troponins are proteins released when the heart muscle is damaged, making them highly sensitive and specific for myocardial injury. CK-MB is an enzyme that becomes elevated in the blood after heart muscle damage, serving as another important marker for myocardial infarction. Myoglobin, although less specific than troponins and CK-MB, can also be indicative of cardiac tissue damage because it is released into the bloodstream when muscle is injured.

In contrast, the albumin cobalt binding test does not assess cardiac function and is not utilized in the context of diagnosing heart attacks or monitoring heart health, which is why it stands out as the answer.