GPT and Cholestatic liver disease: Clinically, ALT and AST levels reflect the damage status of hepatocytes, and the elevated levels of ALP and γ-GT are used as the criteria for judging cholestatic liver disease (Chinese Society of Hepatology, Chinese Medical Association; Chinese Society of Gastroenterology, Chinese Medical Association; Chinese Society of Infectious Diseases, Chinese Medical Association, 2016; Wei, 2016).