Dark brown urine appears when conjugated bilirubin or muscle pigment (myoglobin) enters urine. In hepatitis or bile obstruction, bilirubin darkens urine; after muscle injury or rhabdomyolysis, myoglobin causes similar discoloration. Labs: LFT, CK, and urinalysis differentiate both. https://www.merckmanuals.com/professional/hepatic-and-biliary-disorders/cholestatic-disorders/overview-of-cholestasis | https://www.ncbi.nlm.nih.gov/books/NBK558963/
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