Final answer:
The nurse should observe the client for an allergic reaction to the contrast material immediately after an intravenous pyelogram (IVP).
Step-by-step explanation:
After an intravenous pyelogram (IVP), the nurse should immediately observe the client for an allergic reaction to the contrast material. IVP involves injecting a contrast material into the veins, which may cause an allergic reaction in some individuals. Symptoms of an allergic reaction can include hives, itching, swelling, difficulty breathing, and a drop in blood pressure. Prompt recognition and treatment are vital to prevent a severe allergic reaction.