A nurse is preparing to administer a blood component to a client. Which blood component is responsible for promoting clot formation and controlling bleeding?

A) Incorrect: Slowing down the transfusion rate is not the appropriate action in this scenario. The client is experiencing signs of an allergic reaction, and the nurse must act promptly to address the situation.

B) Incorrect: Elevating the client's feet and lowering the head (Trendelenburg position) is not indicated for an allergic reaction. It may be used for clients in shock, but the priority is to manage the allergic reaction.

C) Correct: The nurse should immediately discontinue the transfusion and initiate the infusion of normal saline to maintain the client's intravascular volume. Discontinuing the blood transfusion helps prevent further exposure to the allergen (if an allergic reaction is confirmed) and addresses fluid volume needs.

D) Incorrect: While administering an antihistamine may be part of the treatment plan for an allergic reaction, it is not the immediate action. The nurse should first discontinue the transfusion and infuse normal saline as stated in option C.

A) Correct: Pre-medicating the client with antihistamines before the transfusion can help prevent or minimize allergic transfusion reactions in clients with a history of severe allergies. Antihistamines block histamine release, reducing the risk of allergic symptoms.

B) Incorrect: Administering the blood transfusion rapidly is not a preventive measure for allergic transfusion reactions. In fact, rapid administration may increase the risk of adverse reactions.

C) Incorrect: Warming the blood product before administration is important to prevent hypothermia but is not directly related to preventing allergic transfusion reactions.

D) Incorrect: Monitoring the client's vital signs during the transfusion is a standard practice, but it is not the primary intervention for preventing allergic transfusion reactions. Pre-medication with antihistamines is a more targeted approach.