It is used for research and clinical diagnostic assays for liver disease. Alanine transaminase (GPT/ALT) is used in multi-analyte clinical chemistry controls and calibrators for major IVD manufacturers. The alanine aminotransferase (ALT) blood test is typically used to detect liver injury. Some of the other applications include Diagnostic Controls, calibrators & standards, immunoassays, clinical chemistry, testing/assay validation, life Science, manufacturing, validation Studies.