Before an IVP, which allergy is particularly important to screen for?

• A. Latex allergy
• B. Pollen allergy
• C. Shellfish allergy
• D. Iodine allergy

Answer: (C)

The key idea is preventing an allergic reaction to the contrast used for IVP. The test emphasizes screening for a shellfish allergy because iodinated contrast media (used in IVP) can provoke reactions in people who have sensitivities linked to iodine-containing substances. While a true iodine allergy is uncommon, shellfish allergy has historically been used as a quick flag that a patient may be more likely to have a reaction to iodinated contrast. If a patient reports shellfish allergy, the clinician should review any history of reactions to contrast, consider premedication or choosing an imaging method that doesn’t use iodinated contrast when appropriate, and ensure readiness to manage an allergic reaction. Latex and pollen allergies may matter for other aspects of care or setup, but they don’t directly signal risk from the contrast itself as strongly as a shellfish history does.