Delayed hemolytic transfusion reaction

A delayed hemolytic transfusion reaction is a type of transfusion reaction.

This can occur one to four weeks after the transfusion. One way this can occur is if a person without a Kidd blood antigen receives a Kidd antigen in a transfusion. Other common blood groups with this reaction are Duffy and Kell. A hemolytic reaction can occur between 3 and 14 days as a result of a secondary immune response, with a drop in hemoglobin level, fever, jaundice, or hemoglobinuria.