GPT and diabetes mellitus: In addition to the known risk factors for diabetes, dyslipidemia and hypertension, subjects in Cluster 4 were also positively associated with the levels of γ-glutamyltransferase (γ GT), serum glutamic-pyruvic transaminase (SGPT, also called alanine aminotransferase, ALT) and uric acid (URATE) as well as white blood cell count (WBC).