Paroxysmal cold hemoglobinuria (PCH) is often associated with which antibody?

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Prepare for the MT AAB Immunohematology Test with our engaging online quiz. Study with multiple-choice questions and detailed explanations. Boost your understanding and be exam-ready!

Multiple Choice

Paroxysmal cold hemoglobinuria (PCH) is often associated with which antibody?

Explanation:
Paroxysmal cold hemoglobinuria is driven by a biphasic IgG autoantibody that targets the P red cell antigen. The Donath-Landsteiner antibody binds to red cells in the cold, fixes complement, and then causes intravascular hemolysis when the cells are warmed to body temperature. This cold-induced binding and subsequent warming-triggered lysis describe the episodic hemolysis seen in PCH, making anti-P the classic antibody associated with this condition. Other choices target different red cell antigens (Kell, MNS, Lewis) and are not linked to the P antigen–mediated mechanism of PCH.

Paroxysmal cold hemoglobinuria is driven by a biphasic IgG autoantibody that targets the P red cell antigen. The Donath-Landsteiner antibody binds to red cells in the cold, fixes complement, and then causes intravascular hemolysis when the cells are warmed to body temperature. This cold-induced binding and subsequent warming-triggered lysis describe the episodic hemolysis seen in PCH, making anti-P the classic antibody associated with this condition. Other choices target different red cell antigens (Kell, MNS, Lewis) and are not linked to the P antigen–mediated mechanism of PCH.

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