An antibody to a low frequency antigen in the patients serum. A mixture of antibodies. An antibody to a high frequency antigen. There is no need to crossmatch the autologous units. The normal pretransfusion protocols are carried out.
Autologous units are to be used only for the patient who donated the units.
Autologous units are stored in a blood refrigerator. You have just performed a four unit crossmatch. Three units were compatible, the screening cells and the auto control were also negative. An antibody to a high frequency antigen. Same ABO and Rh groups as the mother.