In clinical practice, the main liver function tests include aminotransferases, with glutathione aminotransferase. Glutathione aminotransferase. There is bilirubin, including direct bilirubin, indirect bilirubin and total bilirubin. There are alkaline phosphatase, GGT, and also bile acids as well as alkaline phosphatase and other related tests, the most important in liver function are the results of the above items. For normal people, if there is an elevation of transaminases, liver damage is most often considered at this time, and it is necessary to rest more and take liver-protective drugs if necessary. If the bilirubin value exceeds 34.2 μmol/L and the increase in direct bilirubin is the main cause, the bilirubin is usually caused by obstructive factors, and the cause should be identified and treated actively. If indirect bilirubin is predominantly elevated, jaundice is most likely caused by hepatocyte necrosis, and active treatment is needed after identifying the cause. For alkaline phosphatase and GGT, these two indicators mainly reflect the presence of bile duct obstruction and whether it is an auxiliary indicator of obstructive jaundice. If alkaline phosphatase is elevated, together with elevated bilirubin, total bilirubin and direct bilirubin, the patient is usually considered to have obstruction in the bile duct.