The liver is the largest gland in the body and has the function of metabolizing substances, synthesizing many enzymes, participating in vitamin, hormone and bilirubin metabolism and detoxification. The five items of liver function may be different in each hospital, most of them include glutathione, glutamic oxalacetic transaminase, total serum bilirubin, direct bilirubin and indirect bilirubin. 1.Glutathione: it can maintain the intracellular amino acid metabolism, the normal reference value is 40U/L. Elevated glutathione content can be seen in drug poisoning or active hepatitis, especially in viral hepatitis, where elevated glutathione is predominant. 2.Glutamic oxalacetic aminotransferase: mainly distributed in the heart muscle, liver, skeletal muscle and other tissues, the normal range should be 8-40U/L, elevated values can be seen in liver diseases, among which alcoholic hepatitis and drug-related hepatitis are dominated by elevated glutamic oxalacetic aminotransferase. In addition, acute myocardial infarction and skeletal muscle diseases can also lead to elevated glutamic oxalacetic aminotransferase; 3, serum total bilirubin: the normal range of serum total bilirubin for adults is 3.4-17.1 mmol/L. Elevated serum total bilirubin, if accompanied by elevated direct bilirubin, may be cholecystitis, gallbladder stones, gallbladder polyps and gallbladder tumors. If elevated total bilirubin is accompanied by elevated indirect bilirubin, it may be a hemolytic disease; 4. Direct bilirubin: the normal range is 0-6.8 mmol/L. Elevated direct bilirubin is seen in patients with hepatocellular jaundice caused by chronic hepatitis and other diseases, as well as biliary jaundice caused by cholelithiasis; 5. Indirect bilirubin: the normal range is 1.7-10.2 mmol/L. Elevated values Mostly seen in patients with hemolytic jaundice, neonatal jaundice and hepatocellular jaundice. Patients with abnormalities in some of the indicators after performing the five liver tests should not be overly nervous first, as they are not necessarily caused by diseases. Transaminase levels may also be elevated in people who stay up late, have a high-fat diet, or have a recent history of taking medication. It is recommended that patients get their labs and promptly follow up with their doctors, who will combine several common indicators to make a comprehensive judgment and then decide whether treatment is needed.