While receiving a transfusion of packed red blood cells, a school-aged child begins to experience itchy skin, hiver a tonsillectomy. What should the nurse do first for this child?

A. Obtaining a blood culture is important but is not the immediate priority when a transfusion reaction is occurring. B. Stopping the transfusion is the first step in managing a transfusion reaction to prevent further exposure to the allergen or irritant causing the symptoms. C. Slowing the transfusion rate might not be sufficient if a reaction is occurring; stopping it is crucial. D. Providing a diuretic is not relevant to the management of an acute transfusion reaction.