RESUMEN
Delayed hemolytic transfusion reaction occurs when the transfused red cells possess an antigen to which the patient has been previously sensitized. Red cells are destructed by an antibody not detected by compatibility testiing some time after the transfusion. Anti-E(rh") is the Rh antibody that found second most commonly after anti-D in Korea, but very seldom causes hemolytic disease. Recently we experienced a case of delayed hemolytic transfusion reaction due to anti-E(rh") in a 37-year-old woman. Three days after the transfusion, she showed a fall in hematocrit and elevation of indirect bilirubin and LDH accompanied by a positive indirect antiglobulin test. Anti-E(rh") was identified in the patient's serum by antibody screening and identification test.