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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.
Quick Answer. The normal range for the alanine aminotransferase, or ALT, enzyme which is liver specific is 10-100 U/L, according to the Canine Liver Disease Foundation. Elevated ALT enzymes are usually due to cell damage caused by leakage. Continue Reading.