A nurse is assisting with the care of a client who is in hemorrhagic shock and has a prescription for packed red blood cells. Which type of blood can be administered to the client while awaiting blood from a type and cross-match?

A. Type B blood contains B antigens. If the recipient’s blood type is not B, their immune system can recognize these antigens as foreign, triggering a hemolytic transfusion reaction, which can cause acute hemolysis, shock, renal failure, or death. Therefore, type B cannot be safely given to a patient of unknown blood type. B. Type A blood contains A antigens. Giving type A blood to a patient whose blood type is unknown could also provoke a severe immune response, especially if the recipient has anti-A antibodies. This makes type A unsafe in an emergent transfusion situation. C. Type AB blood contains both A and B antigens, making it unsuitable as a universal donor for red blood cells. Only type AB recipients can safely receive AB red blood cells. Administering AB blood to a patient of unknown type can result in life-threatening hemolysis. D. Type O red blood cells, especially O negative, are considered universal donors because they lack A, B, and Rh antigens, meaning they are least likely to provoke an immune reaction in recipients of unknown blood type. In hemorrhagic shock, the patient’s priority is rapid restoration of circulating volume and oxygen-carrying capacity. Type O blood can be safely administered immediately while waiting for type-specific cross-matched blood, preventing further hypoxia, organ damage, and shock progression.