The preferred blood type for transfusing to a person with blood type A Rh- is ________, but when it is unavailable, blood type(s) _________ may be used.

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The preferred blood type for transfusing to a person with blood type A Rh- is also A Rh-, but when it is unavailable, blood type O Rh- can be used as it is the universal donor and will not cause a transfusion reaction. Blood type A Rh+ should not be used as it contains the Rh antigen which can cause a reaction in the recipient who is Rh-. Blood type AB Rh- should also not be used as it contains both A and B antigens which can react with the recipient's anti-A antibodies. Blood type O Rh+ can be used as a last resort, but it should be noted that it contains the Rh antigen so there may still be a risk for a transfusion reaction.

The Preferred Blood Type for Transfusing to a Person with Blood