1. Blood type switch

http://www.bbc.co.uk/worldservice/learningenglish/newsenglis...


2. Division of Medical Laboratory Science, University of Alberta
http://www.ualberta.ca/~pletendr/tm-modules/rh/70rh-switch.h...
„Switching Rh(D) groups involves different considerations than does switching ABO groups. When switching the latter, we are concerned about regularly occurring ABO antibodies causing immediate intravascular hemolysis (IVH) and associated morbidity and mortality. When switching Rh(D) types, we are primarily concerned about the highly immunogenic D antigen stimulating anti-D in Rh(D) negative patients. Production of anti-D will not cause an immediate transfusion reaction. However, it would mean that the patient could never again receive Rh(D) positive red cells; and for women in the child-bearing years or younger, anti-D may cause hemolytic disease in offspring.
If Rh(D) positive blood is unavailable for Rh(D) positive patients:
Rh(D)- negative RBC can be issued. There should be no problems for Rh(D) positive patients who lack irregular alloantibodies such as anti-c, etc. ... „
3. Massive Transfusion Policies
... Switching Rh negative patients to Rh positive blood components when Rh negative blood components are unavailable or in short supply ....
http://www.transfusionmedicine.ca/resources/books/vein-vein/...