Which laboratory pattern best indicates intravascular hemolysis?

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Multiple Choice

Which laboratory pattern best indicates intravascular hemolysis?

Intravascular hemolysis causes red cells to lyse within the circulation, releasing hemoglobin and iron and prompting a multi-faceted lab response. The best pattern here includes elevated LDH from RBC destruction, an increased reticulocyte count as the marrow ramps up red cell production, more urobilinogen from the higher bilirubin turnover, and higher ferritin as iron is released and stored. Together these changes reflect active intravascular destruction with downstream processing of bilirubin and iron. Other patterns are less specific: a rise in urobilinogen alone doesn’t confirm intravascular hemolysis, a positive direct antiglobulin (Coombs) test points to an immune-mediated process and isn’t specific to intravascular destruction, and decreased ferritin would not fit the iron-release scenario of intravascular hemolysis.

Intravascular hemolysis causes red cells to lyse within the circulation, releasing hemoglobin and iron and prompting a multi-faceted lab response. The best pattern here includes elevated LDH from RBC destruction, an increased reticulocyte count as the marrow ramps up red cell production, more urobilinogen from the higher bilirubin turnover, and higher ferritin as iron is released and stored. Together these changes reflect active intravascular destruction with downstream processing of bilirubin and iron.

Other patterns are less specific: a rise in urobilinogen alone doesn’t confirm intravascular hemolysis, a positive direct antiglobulin (Coombs) test points to an immune-mediated process and isn’t specific to intravascular destruction, and decreased ferritin would not fit the iron-release scenario of intravascular hemolysis.

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