A nurse is caring for a client who is receiving a blood transfusion. The client reports itching and hives. Which of the following actions should the nurse take first?

Choice A reason: Administering diphenhydramine treats allergic symptoms but does not address the ongoing transfusion reaction. Stopping the transfusion prevents further allergen exposure, making this a secondary action. Choice B reason: Stopping the transfusion is the first action, as itching and hives indicate an allergic reaction. Halting the infusion prevents worsening symptoms, like anaphylaxis, making this the priority intervention. Choice C reason: Notifying the provider is necessary but follows stopping the transfusion. Ceasing the infusion immediately mitigates the reaction, ensuring patient safety, making notification a subsequent step. Choice D reason: Obtaining vital signs provides data but delays addressing the reaction. Stopping the transfusion halts allergen administration, taking precedence over assessment, making this a secondary action.