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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.
According to WebMD, ALT, also known as alanine aminotransferase, is an enzyme present in blood. Previously known as SGPT, or serum glutamic pyruvic transaminase, it is released by a damaged or diseased liver. As such, high levels of ALT are usually a sign of liver damage.