Total bilirubin of 31.7 μmol/L is not in the normal range. Total bilirubin is an important indicator in hepatobiliary function tests. The normal range of total bilirubin in normal adults is 1.7 to 17.1 μmol/L. The level of total bilirubin 31.7 μmol/L has exceeded the normal level in adults, but not more than 34.2 μmol/L, which is clinically known as latent jaundice, i.e., it does not show obvious yellow coloration of the skin and mucous membranes, but it should be taken seriously. The total bilirubin of 31.7μmol/L suggests that it may be related to physiological causes such as prolonged late-night stay, fatigue, irregular diet and lifestyle, as well as pathological causes such as hemolytic disease, chronic viral hepatitis, biliary cirrhosis, cholelithiasis, and so on. It is recommended to consult a doctor in time and have a clinical physician analyze and judge the cause of the disease with the history, symptoms and signs, and then carry out the treatment to avoid delaying the condition.