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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.
An alanine aminotransferase (ALT) test measures the level of ALT enzyme in your blood. ALT is an enzyme produced by liver cells. It helps the body metabolize proteins. If the liver is damaged or not functioning properly, ALT is released into the blood. This causes ALT levels to increase.The alanine aminotransferase (ALT) test is used to evaluate liver function. The test is also known as a serum glutamate pyruvate transaminase (SGPT) test or alanine transaminase test.f the liver is damaged or not functioning properly, ALT is released into the blood. This causes ALT levels to increase. The alanine aminotransferase (ALT) test is used to evaluate liver function.