Indirect bilirubin of 23.3 μmol/L is mildly elevated and not serious. Causes of elevated indirect bilirubin include heavy drinking and staying up late, liver disease, drug effects and other factors. 1. Heavy drinking and staying up late: both can cause mildly elevated indirect bilirubin. Usually, it will decrease to normal after quitting drinking and resting, which is not serious. 2. Liver disease: hepatocellular jaundice, jaundiced hepatitis, chronic active hepatitis, etc. can cause elevated values of indirect bilirubin, if mildly elevated, this usually suggests that the disease is not too serious, standardized and active treatment can be restored to normal. 3. Drugs: If long-term use of statin drugs, non-steroidal anti-inflammatory drugs, antibiotics and so on can lead to liver damage, causing indirect bilirubin elevation, if it is mildly elevated may be considered liver damage is not serious. If there is indirect bilirubin 23.3μmol / L, it is recommended to go to the hospital as soon as possible, under the guidance of the doctor to identify the causes of active treatment.