<prompt> The normal range of total serum bilirubin is:0.2-1.2 mg100 ml1.5-1.8 mg100 ml2.0-4.0 mg100 mlAbove 7.0 mg100 ml  <response>: Ans. A.0.2-1.2mg100mlIncrease in serum bilirubin 2.4mgdl leads to jaundice. Bilirubin in serum exists in two forms: Freeunconjugatedindirect bilirubin which is water insoluble. Conjugatedirect bilirubin which is water soluble. Can be estimated by Van den Bergs diazo reaction. 