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A food allergy is an abnormal immune response to food. The symptoms of the allergic reaction may range from mild to severe. They may include itchiness, swelling of the tongue, vomiting, diarrhea, hives, trouble breathing, or low blood pressure. This typically occurs within minutes to several hours of exposure.
Shellfish allergies are highly cross reactive, but its prevalence is much higher than that of fish allergy. Shellfish allergy is the leading cause of food allergy in U.S adults. As of 2018 six allergens have been identified to prawn alone; along with crab, it is the major culprit of seafood anaphylaxis.
Allergy blood tests measure the presence of IgE antibodies to specific foods, pollens, mites, animals, insects and other environmental factors. (IgE, short for "immunoglobulin E", is the antibody that triggers food allergy symptoms.) The doctor looks at the test results to help determine if the patient has allergies.
An allergy test revealed Liam was allergic to eggs, as well as peanuts and tree nuts, and for the next year, the entire family avoided foods that could trigger a dangerous reaction.
Food allergies affect mostly young children, and approximately 90 percent of these allergies are caused by just eight foods: cow's milk, eggs, soy, peanuts, tree nuts, wheat, fish, and shellfish.
Oral food challenge. Purpose. Detect a specific food allergy. An oral food challenge is a method for determining if a person has a specific food allergy. It involves giving increasing amounts of a food and watching to see if an allergic reaction occurs. They are potentially dangerous.
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