Which lab results suggest Crigler-Najjar syndrome type 1 syndrome?

Updated: May 21, 2019
  • Author: Hisham Nazer, MBBCh, FRCP, DTM&H; Chief Editor: BS Anand, MD  more...
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Except for the presence of high serum unconjugated bilirubin levels, the results of liver tests in Crigler-Najjar syndrome type 1 are normal. Serum bilirubin levels range from 20-50 mg/dL. Conjugated bilirubin is absent from serum, and bilirubin is not present in urine.

Bile collected through duodenal aspiration is light yellow because of small amounts of unconjugated bilirubin. Bilirubin conjugates are nearly absent from the bile.

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