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Some common liver function tests include: 1  Alanine transaminase (ALT). ALT is an enzyme found in the liver that helps your body metabolize protein. 2  Aspartate transaminase (AST). AST is an enzyme that helps metabolize alanine, an amino acid. 3  Alkaline phosphatase (ALP). ALP is an enzyme in the liver, bile ducts and bone.  Albumin and total protein.
The alanine aminotransferase (ALT) test is a blood test that checks for liver damage. Your doctor can use this test to find out if a disease, drug, or injury has damaged your liver. Your liver does a lot of important things for you: It makes a fluid called bile that helps your body digest food. It removes waste products and other toxins from your blood.