Clinical liver function abnormalities generally require looking at a variety of items such as serum enzymatic tests, serum bilirubin, protein, and plasma coagulation factors. After consultation, the clinician will recommend the tests to the patient based on the complaints and typical symptoms, and the patient can follow the doctor’s instructions: 1. Serum enzymatic tests: liver-related enzymes mainly include glutamic oxalyl aminotransferase, glutamic alanine aminotransferase, gamma-glutamyl transpeptidase and alkaline phosphatase, etc. Increased serum enzyme levels often indicate liver cell damage and abnormal liver function; 2. Serum bilirubin: bilirubin It needs to be metabolized by the liver, and can be divided into direct bilirubin and indirect bilirubin, which are collectively called total bilirubin. Both total bilirubin and direct bilirubin are elevated, which often indicates abnormal liver function; elevated indirect bilirubin is mostly caused by hemolysis, and elevated direct bilirubin indicates biliary obstruction; 3, protein: the liver is an important place for synthesizing albumin, and the normal range of albumin is 35-55g/L. In the absence of proteinuria, i.e., relatively normal kidney function, a decrease in albumin level represents significantly reduced liver function. In addition, a decrease in the ratio of albumin to globulin also represents a decrease in the level of albumin, suggesting abnormal liver function; 4, plasma coagulation factors: most coagulation factors are synthesized in the liver, and impaired liver function may affect coagulation indicators, which can make the prothrombin time, activated partial thromboplastin time and prolonged prothrombin time, etc. The normal prothrombin time is generally 11-14s, and the time exceeds 14s and is not relieved by vitamin 5, other: fat metabolism, blood ammonia levels, as well as indocyanine green test, lidocaine metabolite generation test, galactose tolerance test and other quantitative liver function tests are also within the scope of liver function tests, and have a suggestive effect on liver function damage.