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Medical Definition of ALANINE AMINOTRANSFERASE. : an enzyme which promotes transfer of an amino group from glutamic acid to pyruvic acid and which when present in abnormally high levels in the blood is a diagnostic indication of liver diseaseâabbreviation ALT; called also glutamic pyruvic transaminase.weet. : an enzyme which promotes transfer of an amino group from glutamic acid to pyruvic acid and which when present in abnormally high levels in the blood is a diagnostic indication of liver diseaseâabbreviation ALT; called also glutamic pyruvic transaminase.
Reference Range. Alanine aminotransferase (ALT) is an enzyme found primarily in the liver and kidney. It was originally referred to as serum glutamic pyruvic transaminase (SGPT). Normally, a low level of ALT exists in the serum. ALT is increased with liver damage and is used to screen for and/or monitor liver disease.