The normal range of serum total bilirubin is generally 5.13-22.24 μmol/L. The current value of total bilirubin is 21.6 μmol/l, which in combination with other indicators is considered normal. However, the reference standards of different hospitals are different, and the judgment of laboratory indicators should be based on the specific reference standards, and there may be differences. In terms of elevated bilirubin level, it may be physiological or pathological. 1. Physiological increase: for example, eating a lot of spicy and greasy food or drinking alcohol or staying up late before the examination will affect the normal metabolism of the liver and the metabolism of total bilirubin; 2. Pathological increase, such as hepatitis and obstructive jaundice. This affects the metabolism of bilirubin, which can cause elevated bilirubin in the blood. If an individual is unsure, he/she may consider reviewing the test in a week’s time in the hospital and consulting with his/her doctor at the same time. Patients should not rely on one test result to determine a particular disease, and are still advised to visit the hospital for a comprehensive diagnosis and treatment.