Autoanti‐K antibody mimicking an alloantibody

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Abstract
A patient with pancytopenia and hypercellulr bone marrow but without evidence of hemolysis had a positive direct antiglobulin test due to a red blood cell autoantibody. Although the patient was K-negative, eluates made from his erythrocytes contained what seemed to be anti-K antibody. The latter could be adsorbed onto and eluted from both K-positive and K-negative cells. This patient is apparently another example of autoanti-K antibody mimicking an alloanti-K antibody.