Liver function fluctuates within the normal range in normal people. Liver function is to reflect the basic condition of liver function through indicators related to liver metabolic function and indicators related to liver injury. Common laboratory tests for liver function include protein metabolism function measurement, lipid metabolism function measurement, bilirubin metabolism test, etc. 1. Determination of protein metabolism function: Normal adult serum total protein is 60~80g/L, albumin is 40~55g/L, and the ratio of white globules is 1.5~2.5:1, and the protein content of normal people can fluctuate slightly. 2. Lipid metabolism function measurement: normal total cholesterol is 2.9~6.0mmol/L. Normal people’s total cholesterol can fluctuate with the change of food. 3. Bilirubin measurement: Normal adult total bilirubin is 3.4~17.1umol/L. Liver function of normal people can fluctuate within the normal range due to the influence of various factors such as eating and sleeping. As the liver has a certain compensatory function, it usually does not exceed the normal value. If abnormal liver function indexes are found, you should go to the hospital in time for standardized treatment.