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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.
Alanine aminotransferase, or ALT, is an enzyme found concentrated in the liver and in small amounts in the kidneys and the heart, states WebMD. An ALT test checks the blood for this enzyme, as its presence indicates potential liver damage. The enzyme's former name was serum glutamic pyruvic transaminase, or SGPT.