Which laboratory test is commonly used to monitor liver function?

• A. Creatinine
• B. ALT
• C. Troponin
• D. BNP

Answer: (B)

The laboratory test commonly used to monitor liver function is alanine aminotransferase (ALT). ALT is an enzyme found primarily in the liver, and its levels in the blood can indicate liver health. When liver cells are damaged, ALT is released into the bloodstream, resulting in elevated levels. Therefore, measuring ALT is a critical component of evaluating liver function and diagnosing liver conditions.

The other tests listed do not serve this purpose. Creatinine, for example, is primarily used to assess kidney function, as it is a waste product filtered by the kidneys. Troponin is a marker used to evaluate heart muscle injury, particularly in the context of myocardial infarction (heart attack). BNP, or B-type natriuretic peptide, is used mainly to assess heart failure. Each of these tests provides valuable information, but ALT is specifically relevant for monitoring the liver's health and function.