there is no correlation between contrast allergies and shellfish allergies. this is a myth that has persisted in the medical field since the 70's but is untrue. shellfish allergies are caused by a muscle protien in the shellfish (tropomyosin). you can't be allergic to iodine. it is in your body in your thyroid gland breast tissue and many other places. without iodine in your body you can not live.
no allergy to shellfish. ct scan w/contrast-mild reaction of hives. would there be allergic reaction to shell fish now?