Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) are two liver enzymes measured in a blood test to check the health of your liver. High AST and ALT levels are a general sign of ...

When liver cells are damaged, they release ALT into the blood. That means high ALT levels could be a sign of liver disease or damage. ALT blood tests help healthcare providers assess the health of ...