ALT

Alanine aminotransferase, usually referred to as ALT, is an enzyme concentrated primarily in the liver. Enzymes are proteins that facilitate important functions in the body.

An ALT test measures the amount of this enzyme in the blood. ALT levels can increase when liver cells are damaged, so the test can be used to evaluate the condition of the liver.

In general, ALT is not tested alone. Instead, it is usually measured along with other liver enzymes as part of a panel test like the liver panel or comprehensive metabolic panel (CMP).Alanine aminotransferase, usually referred to as ALT, is an enzyme concentrated primarily in the liver. Enzymes are proteins that facilitate important functions in the body.