Can You Be Allergic To Shellfish But Not Iodine

By Mayo Clinic Staff. So concern for allergic reactions to contrast media in people with shellfish allergy has been a myth all along but unfortunately one that continues to.

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Iodine does not cause allergy.

Can you be allergic to shellfish but not iodine. The major allergens in shellfish are tropomyosins which are proteins is the muscle and definitely not iodine. There is a well established myth that fish and shellfish allergy is linked to the iodine content of fish and that iodine allergy and shellfish allergy. According to a study published in the Journal of Emergency Medicine shellfish allergies arent linked to an allergy to iodine.

If youre reacting to shellfish the iodine it contains is unlikely to be responsible. Interestingly iodine is also not the cause of allergic reactions to shellfish which is caused by muscle proteins called tropomyosin. Iodine is not an allergen.

Shellfish and seafood also contain iodine but that isnt whats responsible for food allergies. The researchers concluded that iodine isnt an allergen. Just 3 ounces of cod for instance contains 99 micrograms of iodine.

Youre also not allergic to iodine just because you are allergic to shellfish or seafood. According to the American College of Allergy Asthma and Immunology Years ago doctors believed that shellfish allergy stemmed from increased amounts of iodine present in the shellfish so patients with a shellfish allergy were told to avoid iodine. The risk is very low somewhere around the 2 to 3 percent range meaning that if youre allergic to shellfish you will also be allergic to iodine contrast agents used for MRIs or other guided imagery procedures.

While shellfish allergy is a very real allergy and potentially life threatening it is not an iodine allergy. There is about a three percent chance that if you are allergic to shellfish you will have a reaction to contrast dyes but this percentage is about the same in people with no known shellfish allergy4. The same serving size of shrimp has 35 micrograms.

Tropomyosins cross react among various shellfish but not scaled fish so that is why you can be allergic to crab and eat salmon. Shellfish and seafood also contain. There is about a three percent chance that if you are allergic to shellfish you will have a reaction to contrast dyes but this percentage is about the same in people with no known shellfish allergy.

Iodine in shellfish does not cause allergies. However shellfish allergies are not linked to iodine. Youre also not allergic to iodine just because you are allergic to shellfish or seafood.

Fish and shellfish are among the most common natural sources of dietary iodine. People with shellfish allergy often avoid iodine products because of a commonly held belief that people with a shellfish allergy also have an allergy to iodine. If you are allergic to shellfish specific proteins found in these foods are the allergens not iodine4.

This is because iodine is naturally present in seawater and seaweed. Iodine is not an allergen. If you are allergic to shellfish specific proteins found in these foods are the allergens not iodine.

65k views Answered 2 years ago. Seafood allergies and shellfish allergy are not caused by iodine. Tropomyosins cross react among various shellfish but not scaled fish so that is why you can be allergic to crab and eat salmon.

The shellfish allergy is due to a specific protein found in the fish its not due to iodine. Having a shellfish allergy however does not mean youre also allergic to iodine according to Cleveland Clinic 2 3. Atopy in general confers an increased risk of reaction to contrast administration but the risk of contrast administration is low even in patients with a history of iodine allergy seafood allergy or prior contrast reaction.

Fish and shellfish allergy is the result of allergy to proteins in the meat. Although shellfish does contain iodine a teaspoon of iodized table salt contains over 10x as much iodine as 3 oz of shrimp. If you are allergic to shellfish specific proteins found in these foods are the allergens not iodine.

It is however possible to have an allergy to both shellfish and iodine. It is more likely due to distinctive allergens found in these foods. Ask your doctor if you should use iodine products if you have an allergy.

Even though shellfish contain small amounts of iodine shellfish allergy is unrelated to the reactions some people have to radiocontrast material or iodine. Most people who are allergic to shellfish react to certain proteins these foods contain not to iodine. While shellfish allergy is a very real allergy and potentially life threatening it is not an iodine allergy.

Allergies to shellfish in particular do. A person with a shellfish allergy is not any more likely to react to the iodine used in medical practices than anyone else. Seafood allergies and shellfish allergy are not caused by iodine.

One thing you dont need to worry about is if youll also be allergic to iodine or radiocontrast dye thats used in some imaging tests. The major allergens in shellfish are tropomyosins which are proteins is the muscle and definitely not iodine.

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