A total bilirubin of 30.6 μmol/L is considered high and is above the normal reference range. Normally, the reference range for adult serum total bilirubin is 3.4-17.1 μmol/L (may vary slightly depending on the hospital or testing instrument). When the total bilirubin is 30.6 μmol/L, it indicates a mild elevation, and the patient’s condition should be judged in conjunction with other tests and clinical manifestations. When the serum total bilirubin concentration is 17.1-34.2 μmol/L, it cannot be detected by the naked eye, i.e., there is no obvious yellow staining of the skin and mucous membranes, which is called subclinical jaundice or latent jaundice; if it is greater than 34.2 μmol/L, yellow staining of the sclera, skin, mucous membranes, etc., which can be observed with the naked eye, is called overt jaundice. If the total bilirubin test result is 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.