Which laboratory test is important for assessing liver function during parenteral nutrition?

The prothrombin time/international normalized ratio (PT/INR) is an important laboratory test for assessing liver function, particularly during parenteral nutrition. This test evaluates the coagulation status of the blood, which is closely linked to the liver's ability to synthesize clotting factors. The liver is responsible for producing several proteins necessary for blood coagulation, and any impairment in liver function can lead to an elevation in PT/INR values.

When a patient is receiving parenteral nutrition, it is crucial to monitor liver function closely, as this form of nutrition can potentially lead to liver complications, including cholestasis and hepatic dysfunction. An increased PT/INR indicates that the liver may not be functioning optimally and that the patient could be at risk for bleeding due to decreased clotting factors.

While other tests such as serum glucose, complete blood count, and serum creatinine may provide valuable information about different aspects of a patient's health, they do not specifically assess liver function in the same manner as PT/INR. Serum glucose evaluates blood sugar levels, complete blood count assesses overall blood health including red and white blood cells, and serum creatinine measures kidney function. None of these directly provide insight into the liver's ability