Which laboratory test is typically used to assess liver function?

Prothrombin time is the laboratory test that is primarily used to assess liver function. This test measures how long it takes for blood to clot, which is an important function of the liver. The liver produces several proteins that are essential for blood coagulation; therefore, an increased prothrombin time can indicate liver dysfunction or liver disease, as the liver may not be producing adequate clotting factors.

In contrast, the other tests do not specifically evaluate liver function. A complete blood count provides general information about blood cells but does not assess liver-specific functions. Serum creatinine is used to evaluate kidney function, while urine pH measures the acidity or alkalinity of urine and has no direct correlation with liver function. Thus, prothrombin time stands out as the most relevant test for assessing liver health.