Which test is primarily used to measure liver function?

The liver function tests (LFT) are specifically designed to assess the health and functionality of the liver. These tests measure various enzymes, proteins, and substances produced or processed by the liver, providing critical information about liver health. Key components of LFTs include alanine aminotransferase (ALT) and aspartate aminotransferase (AST), which indicate liver cellular integrity, as well as bilirubin levels, which measure the liver's ability to excrete waste.

The other tests mentioned serve different purposes: a complete blood count evaluates overall health and detects disorders like anemia or infection, a blood glucose test assesses sugar levels in the blood relevant to diabetes management, and thyroid function tests measure hormone levels to evaluate thyroid health. Thus, when it comes to specifically measuring liver function, liver function tests are the appropriate choice.