The presence of bilirubin in the urine (bilirubinuria) typically indicates an increase in which form of bilirubin in the blood?
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Correct answer: Conjugated (direct) bilirubin
Only conjugated bilirubin is water-soluble and can pass through the glomerular filter. Therefore, bilirubinuria is seen in conditions like biliary obstruction or hepatitis where conjugated bilirubin levels are elevated.
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