Jaundice measuring instrument is also called transcutaneous cholangiometry, is not harmful to the child, this instrument is through the fiber optic and photoelectronic information processing technology, through the test of jaundice on the skin surface, indirectly deduce the serum total bilirubin level of a kind of instrument, this instrument test is painless, will not cause impact, transcutaneous cholangiometry light is also ordinary light, will not cause impact on the eyes. If you are not sure, you can try not to let your child see this light. The results of the transdermal cholangiometer can initially determine whether the jaundice index is normal or not, and regular monitoring is required. If the jaundice index gradually increases, it is better to know the serum total bilirubin and indirect bilirubin levels by drawing blood from the vein to further determine whether the jaundice is pathologic.