in case of blood transfusion is required

• to reduce the risk of anaphylaxis ↠ washed blood ( IgA deficiency , high IgA antibodies
• to transfuse the immunocompromised  ↠ CMV -ve blood.
• to decrease GVHD ↠ Ɣ irradiated blood
• to reduce febrile reaction, CMV transmission, Alloimmunization, possible recipient ↠ leukoreduced blood
• to decrease Alloimmunization and delayed hemolytic reactions ↠ phenotypically matched (ABO+Rh+Kell Ag matched)

http://www.sld.cu/galerias/pdf/sitios/anestesiologia/practical_guidelines_blood_transfusion.pdf