<prompt> Normal serum bilirubin level is:0.3-1.2 mgdl2-4 mgdl0.1-0.5 mgdl1-2 mgdl  <response>: Ans: c 0.1- 0.5 mgdl Ref: Harper, 23th ed, p. 371; Vasudevan, 4th ed, p. 255Answer is option c since a, b, d have values more than one.Normal plasma bilirubin level ranges from 0.2 - 0.8 mgdl. Of this major fraction is un-conjugated which is about 0.2 - 0.6 mgdl, while conjugated bilirubin is only 0 -0.2 mgdl. If plasma bilirubin level exceeds 1 mgdl, the condition is called hyperbilirubinaemia. The level between 1 and 2 mg dl are indicative of latent jaundice. Level 2 mgdl is jaundice.Direct serum bilirubin: 0.1 - 0.4 mgdl Harper Indirect serum bilirubin: 0.2 - 0.7 mgdl Harper Level more than 1 mgdl is hyper bilirubinemia Harper 