Normal values for total bilirubin for an adult is 1.3-1.0 mg/dL or 5.1-17.0 mmol/L. The normal value for direct bilirubin or conjugated bilirubin is 0.1 - 0.3 mg/dL or 1.7-5.1 mmol/L. For indirect or unconjugated bilirubin, the normal values are 0.2-0.8 mg/dL or 3.4-12.0 mmol/L. Consult your medical practitioner to help understand your bilirubin tests. concentration of conjugated bilirubin in the sample. Biological reference range or cut off: Neonates 1‐13 µmol/L Older children (up to 18 years) 1‐8 µmol/L Adult <5 µmol/L A ‘normal’ level in a very young baby could be an artefact of poor conjugating ability and be falsely reassuring. For those under 18, the normal level will be will be 1 mg/dl. Normal results for conjugated (direct) bilirubin should be less than 0.3 mg/dl. Men tend to have slightly higher bilirubin levels than... It is normal to have some bilirubin in the blood. A normal level is: Direct (also called conjugated) bilirubin: less than 0.3 mg/dL (less than 5.1 µmol/L) Total bilirubin: 0.1 to 1.2 mg/dL (1.71 to 20.5 µmol/L) Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or may test different samples. A marked increase in the bilirubin level ranging from 5 to 20 mg/dL may occur 3.5 to 5.5 months after exposure; an elevation of greater than 20 mg/dL suggests severe disease. Conjugated and unconjugated levels usually parallel each other, except in the rare complication of aplastic anemia when unconjugated bilirubin prevails. Direct (conjugated) bilirubin: less than 0.3 mg/dL; Indirect (unconjugated) bilirubin: about 0.2 to 1.2 mg/dL; Indirect bilirubin is calculated from direct and total figures, where indirect = total minus direct bilirubin. As such, the normal range given for indirect bilirubin is generally the same or very slightly lower than for total bilirubin.
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