USMLE® Step 1 style questions USMLE
A 17-year-old overweight boy, who has recently begun a new diet plan, comes to his primary care physician because his friends have been telling him that he looks “a little yellow” sometimes. Medical history is noncontributory and physical examination shows no abnormalities. Laboratory studies show elevated unconjugated bilirubin concentration. A week later, his bilirubin concentration is measured as normal. Of the following mechanisms, which of the following best explains the pathogenesis of the most likely diagnosis?