Diagnosis and monitoring of liver disease associated with hepatic necrosisAlanine transaminase (ALT) is also called alanine aminotransferase (ALAT) and was formerly called serum glutamate-pyruvate transaminase (SGPT) or serum glutamic-pyruvic transaminase (SGPT). ALT is found in plasma and in various body tissues, but is most common in the liver. This test is commonly measured clinically as biomarkers for liver health. The tests is a are part of Liver function test (LFT).