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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.
What It Is. An alanine aminotransferase (ALT) test is often part of an initial screening for liver disease. The liver plays several important roles: It stores fuel from food, makes proteins, and helps remove toxins from the body. The liver also makes bile, a fluid that helps in digestion.