Total bilirubin of 23.9 micromillimoles per liter is slightly elevated and not considered serious. The normal value of total bilirubin ranges from 1.7 to 20.5 micromillimoles per liter, so total bilirubin 23.9 micromillimoles per liter has some mildly elevated problems. First of all, it is necessary to find out whether there are physiological causes, such as long-term alcohol consumption, strenuous exercise, sleep deprivation can lead to increased bilirubin levels, which will gradually improve after removing the triggers. Pathological causes need to be judged in conjunction with indirect bilirubin and direct bilirubin levels to rule out the presence of acute hepatitis, chronic hepatitis, autoimmune hepatitis, alcoholic hepatitis and other problems. If the total bilirubin level is found to be elevated, it is recommended to consult the gastroenterology department of a regular hospital to find out the cause.