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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.
ALT is an enzyme found primarily in the liver that helps your body metabolize protein. ALT levels in the blood are normally low. Levels increase when the liver is damaged and ALT is released into the bloodstream. AST is an enzyme that helps with the metabolism of alanine, an amino acid. AST is normally found in high concentrations but an increase in AST levels may also indicate liver damage or disease.