Indirect bilirubin is an indicator of liver function tests, and its normal value is between 1 and 20 μmol/L. An increase in indirect bilirubin indicates that there is necrosis of liver cells in the body, and jaundice is caused by the necrosis of liver cells. If the total bilirubin is between 17.1 and 34.2 μmol/L, the patient is considered to have occult jaundice. This means that although the patient has elevated bilirubin, yellow staining of the skin and sclera cannot be detected by the naked eye. If the total bilirubin is higher than 34.2 μmol/L and the indirect bilirubin is higher than 20 μmol/L, the patient is considered to be suffering from hepatocellular necrosis. Patients need to further examine the cause of hepatocyte necrosis, whether it is due to viral hepatitis, autoimmune hepatitis, or cirrhosis due to long-term biliary sludge. Patients should also have an ultrasound of the upper abdomen and an enhanced CT scan of the upper abdomen if necessary.