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

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.