Bilirubin is categorized into total bilirubin, direct bilirubin and indirect bilirubin, and the range of normal values is generally 1.-17.1μmol/L, 0-6.8μmol/L and 1.7-10.2μmol/L. The normal values of total bilirubin are 1.7-17.1μmol/L, 0-6.8μmol/L and 1.7-10.2μmol/L. 1. Normal value of total bilirubin is 1.7-17.1μmol/L. The elevated value suggests abnormal liver function, which is commonly seen in drug hepatitis, viral hepatitis, cirrhosis, liver cancer and other diseases; the low value suggests that the body lacks iron, zinc and other trace elements. 2. Normal value of direct bilirubin is 0-6.8μmol/L. Elevated value suggests biliary excretion disorder, which is common in liver cirrhosis, sepsis, extensive burns and other diseases. 3. Indirect bilirubin has a normal value of 1.7-10.2μmol/L. Elevated values suggest that bilirubin in the body exceeds the processing capacity of the liver, and is commonly seen in hemolytic anemia, severe burns, malaria and other diseases. Bilirubin is an important indicator to reflect the function of the liver. Before the test, it is necessary to pay attention to the need to fast for more than 8 hours, avoid eating greasy, high protein food the day before, and do not drink alcohol, so as not to affect the results. Bilirubin test results should be under the guidance of the physician, combined with the patient’s condition to avoid delays in diagnosis and treatment.