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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.
Liver Enzymes: In regards to liver function tests, the levels of three main enzymes are checked. The first enzyme is alanine transaminase (ALT). It is used in protein digestion and its blood level can rise in abnormal gallbladder function after inflammation or injury.