A nurse is evaluating the allergy profile of a client who has Graves disease and is to undergo a thyroid scan. The nurse should identify which of the following allergies as a contraindication for the client to undergo a thyroid scan?

A. Eggs: Egg allergies are not relevant to thyroid scans, as the procedure does not involve egg-derived products. There is no increased risk of reaction during imaging for clients with egg allergy. B. Latex: Latex allergy is a concern for equipment or supplies that contain latex, but it does not contraindicate a thyroid scan. Precautions can be taken with non-latex alternatives if needed. C. Peanuts: Peanut allergy is unrelated to the substances used in thyroid scans, including radioactive iodine or contrast materials, and does not increase risk for this procedure. D. Iodine: Iodine allergy is a contraindication because thyroid scans often involve radioactive iodine or iodine-containing contrast agents. Exposure can trigger severe allergic reactions, making it essential to identify and avoid iodine in clients with known allergy.