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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.
An alanine aminotransferase (ALT) test measures the level of ALT in your blood. ALT is an enzyme made by cells in your liver. The liver is the bodyâs largest gland.