IgM antibodies are mainly responsible for the clumping (agglutination) of red blood cells if the recipient of a blood transfusion receives blood that is not compatible with their blood type.
Os anticorpos IgM son principalmente responsables da aglutinación de glóbulos vermellos que se produce se o receptor dunha transfusión de sangue recibe sangue que non é compatible co seu tipo sanguíneo.