Harrison's PodClass: Internal Medicine Cases and Board Prep Ep 188: A 22-Year-Old with Abnormal Serum Bilirubin
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Mar 26, 2026 A young college student worries after an incidental bilirubin rise. Conversation covers when jaundice appears and how bilirubin is made and cleared. They explain direct versus indirect bilirubin and which lab patterns point to hemolysis, drugs, or inherited conditions. The discussion narrows to benign inherited causes like Gilbert, plus rare conjugated disorders and why serious liver or biliary disease is unlikely.
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College Student Alarmed By Incidental Bilirubin Rise
- A healthy 22-year-old college student worried his elevated bilirubin meant pancreatic cancer after internet searches.
- He was asymptomatic after a head injury, had normal exam and CT, but bilirubin 2.5 mg/dL on routine labs.
Scleral Icterus Threshold For Detectable Jaundice
- Scleral icterus appears only when serum bilirubin is at least 3 mg/dL and is the earliest physical sign of jaundice.
- Absence of scleral icterus suggests bilirubin elevations below that threshold despite lab abnormalities.
Bilirubin Origin And Hepatic Conjugation Pathway
- Most bilirubin derives from hemoglobin breakdown in senescent red cells and is conjugated in the liver for excretion.
- Disruption can arise from increased production, impaired conjugation, or impaired excretion affecting serum levels.
