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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.
Alanine Aminotransferase (ALT) (SGPT) (GPT) (Liver Function) Blood Test. The ALT level is tested to look for and evaluate damage to the liver. This test measures the amount of an enzyme called glutamate pyruvate transaminase (GPT) in your blood. This enzyme is found in many body tissues in small amounts, but it is very concentrated in the liver.