Which laboratory finding is a hallmark of hemolytic anemia?

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Multiple Choice

Which laboratory finding is a hallmark of hemolytic anemia?

Explanation:
Hemolytic anemia causes increased destruction of red blood cells, releasing heme that is processed into bilirubin. The liver conjugates bilirubin (indirect/unconjugated form) to become direct bilirubin for excretion. When destruction is rapid, the liver can’t keep up, so unconjugated (indirect) bilirubin rises in the blood. Direct bilirubin stays normal or only mildly elevated unless there’s concurrent liver dysfunction or biliary obstruction. ALT and ALP rise with liver injury or cholestasis, not with isolated hemolysis. So the hallmark finding is an elevation of indirect (unconjugated) bilirubin.

Hemolytic anemia causes increased destruction of red blood cells, releasing heme that is processed into bilirubin. The liver conjugates bilirubin (indirect/unconjugated form) to become direct bilirubin for excretion. When destruction is rapid, the liver can’t keep up, so unconjugated (indirect) bilirubin rises in the blood. Direct bilirubin stays normal or only mildly elevated unless there’s concurrent liver dysfunction or biliary obstruction. ALT and ALP rise with liver injury or cholestasis, not with isolated hemolysis. So the hallmark finding is an elevation of indirect (unconjugated) bilirubin.

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