Total bilirubin of 29umol/L is mildly elevated and is a form of occult jaundice, also known as jaundice without meatus. Bilirubin is an indicator of hepatic excretion and conversion function. The normal range of serum total bilirubin in adults is 3.4-17.1umol/L. If the result of total bilirubin is between 17.1~34.2umol/L it is called hidden jaundice. Occult jaundice means that the test result suggests that the total bilirubin level is elevated, slightly above the normal range, and there are no symptoms associated with jaundice, such as yellowing of the sclera and skin. There are many reasons for elevated total bilirubin, such as physiological factors like long-term alcohol consumption, strenuous exercise, or pharmacological factors like taking rifampicin and erythromycin, and pathologic factors like pancreatic head cancer and cholelithiasis. If the patient’s total bilirubin test results appear abnormal, it is recommended to consult a doctor in time to clarify the cause of the disease, and then carry out targeted treatment or therapy under the guidance of the doctor.