A critically injured woman is rushed to the ER. She needs an immediate blood transfusion, and there is no time to cross-match blood type. The nurse anticipates the physician will call for

  1. 1 unit of AB positive blood.
  2. 1 unit of O positive blood.
  3. 1 unit of AB negative blood.
  4. 1 unit of O negative blood.
Number 4 is correct.
Rationale: In an emergency situation, where there is no time to cross-match blood type, a client can be given a blood type O negative transfusion. O negative is considered a universal blood type and can be received by anyone. It is optimal for emergency situations. The other blood types could cause an ABO incompatibility reaction.