Which condition can increase direct bilirubin?

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Direct bilirubin rises when bile flow is blocked, preventing conjugated bilirubin from being excreted into the intestine. An extrahepatic bile duct obstruction, such as a stone or tumor blocking the common bile duct, stops bilirubin from reaching the gut, so the conjugated form backs up into the blood and appears elevated in serum (and can cause dark urine with pale stools). In contrast, hemolysis releases more bilirubin as unconjugated (indirect) bilirubin because the problem is overproduction rather than impaired excretion, so direct bilirubin stays normal or only mildly affected. Pancreatic insufficiency alone usually doesn’t raise direct bilirubin unless it leads to biliary obstruction, and dehydration doesn’t specifically elevate the conjugated fraction.