But, what would happen to you if you have O neg. and you had already had ONE emergency transfusion of a cross type.
Hopefully, this experiment will work out for the good in saving lives.
Say your prayers. Get the largest advisable dose of intravenous corticosteroid, e.g. solumedrol, have available intravenous epinephrine and diphenhydramine hydrochloride, i.e. intravenous Benadryl, at the bedside, call for a hematology consult immediately and prepare for the worst transfusion reaction.
Universal blood donor type: Is there such a thing?
What is the universal blood donor type?
Mayo Clinic hematologist Ruben Mesa, M.D., and colleagues answer select questions from readers.
Answer
There is no universal blood donor type. Donated blood is routinely classified by type as A, B, AB or O, and as Rh positive or Rh negative. In the past, people with Type O/Rh negative blood were considered universal blood donors. This implied that anyone, regardless of blood type, could receive Type O/Rh negative blood without risking a transfusion reaction.
But scientists now have a much better understanding of the complex issues related to reactions to incompatible blood donor types. Even donors with Type O/Rh negative blood may have antibodies in their blood that cause serious reactions.
Before a blood transfusion, small samples of the recipient's and donor's blood are mixed to check compatibility. Doctors refer to this as crossmatching. Despite all such precautions, adverse transfusion reactions may still occur.