blood enzyme activity level blood alanine aminotransferase activity level VT:0001573 clinical_measurement_ontology mshimoyama blood ALT activity level blood alanine transaminase activity level 2011-11-02T04:09:38Z CMO:0000574 blood glutamic-pyruvate transaminase activity level blood GPT activity level The amount of enzymatic activity of glutamic-pyruvate transaminase enzyme, commonly known as alanine transaminase or alanine aminotransferase (ALT), enzyme in a specified sample of blood. ALT catalyzes the reversible transamination between alanine and 2-oxoglutarate to generate pyruvate and glutamate. Blood ALT level is used as an enzymatic marker for liver disease or damage.