Radiocontrast media . People with shellfish allergy are sometimes told they should avoid iodine and radioconstrast media (rcm). This is not true and is a myth. Iodine does not cause allergy. While people who have any allergies may have a slightly higher risk to a reaction to rcm, it is still low. Shellfish allergy does not increase the risk for a reaction.
This is myth. Shellfish allergy is one of the more common food allergies, mainly in adults, but the idea that iodine should also be avoided is a myth. Iodine does not cause allergy. Although shellfish does contain iodine, a teaspoon of iodized table salt contains over 10x as much iodine as 3 oz of shrimp. Fish and shellfish allergy is the result of allergy to proteins in the meat.