A delayed transfusion reaction caused by anti‐K6

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Abstract
The demonstration of anti-K6 as the single antibody responsible for a delayed transfusion reaction is illustrated in the case of a 42-yr-old white women who received 3 U of red blood cells for an episode of gastrointestinal bleeding from a duodenal ulcer. Twenty-three days following transfusion, laboratory and clinical evidence of hemolysis was noted. An anti-K6 was identified in the serum and in the serum and in an eluate prepared from the patient''s red blood cells. One of the 3 U transfused was positive for the K:6 antigen.