What Does a Low ALT and AST Signify?

The alanine transaminase (ALT) test and aspartate aminotransferase (AST) test are two of the most common liver function tests that are ordered. Your doctor typically orders these types of blood tests because he or she suspects some type of liver disease or other abnormality. AST and ALT are both enzymes that the liver releases, usually in response to infection, damage, or disease. While these two tests measure different enzymes, they are typically ordered concurrently, often along with other liver function tests.