Which test assesses the function of the liver?

The liver function tests (LFTs) are specifically designed to evaluate the health and functionality of the liver. These tests measure various enzymes, proteins, and substances in the blood that can indicate how well the liver is functioning and whether there are any signs of liver damage or disease.

LFTs typically include measurements of enzymes such as alanine aminotransferase (ALT) and aspartate aminotransferase (AST), which can indicate liver cell injury, as well as alkaline phosphatase (ALP) and bilirubin, which help assess bile duct function and the liver's ability to process waste products. Additionally, tests measuring albumin and prothrombin time can provide insights into the liver's synthetic function.

In contrast, the blood glucose test primarily assesses levels of glucose in the blood, indicating issues related to diabetes or metabolic disorders. The thyroid function test evaluates the performance of the thyroid gland and its hormone levels, which are not related to liver function. The complete metabolic panel, while it includes some components that can provide insights into liver health, is broader and assesses various metabolic functions beyond just the liver, including kidney function and electrolyte levels. Thus, liver function tests are the most direct measure of liver health.