Jaundice in general 0-17μmol / L belongs to the normal range, some hospitals because of the application of different reagents, the normal range varies, for example, some hospitals the normal range is 0-20μmol / L, this time it is necessary to look at the jaundice value behind the labeled normal range is how much to decide whether the jaundice value is normal or not. In most cases, the jaundice value is within 0-17μmol/L and the patient does not feel anything. When the jaundice value rises to within two times the normal value, i.e., within 34 μmol/L, the patient will not be able to see the yellowing of the skin and mucous membranes, which is called hidden jaundice. When the jaundice value is higher than 34 μmol/L, it is called overt jaundice, and the patient’s sclera, skin and mucous membranes can be seen to have a yellowish color.