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Food Allergy Guidelines Aim to Reduce Misdiagnosis
Recommendations Designed for Primary Care Docs, Subspecialists
"Many people say they have food allergies, but not all of them are really allergies," said Barbara Yawn, M.D., MSc., director of research at the Olmsted Medical Center and adjunct professor of family and community health at the University of Minnesota. A member of the guideline panel, Yawn told AAFP News Now that the oral food challenge is the preferred test for diagnosing such allergies.
"Food allergies, other than those causing anaphylaxis, should be tested, and the best way to test is by removing the food from the diet for several days and then reintroducing it," she said.
Academy Resources Inform Members, Patients About Allergies
The Academy also offers resources to help educate patients about food allergies. FamilyDoctor.org's allergy Web page has links for children and teens dealing with food allergies, as well as a section featuring facts and myths about food allergies and information about anaphylaxis.
Matthew Fenton, Ph.D., chief of the Asthma, Allergy and Inflammation Branch of the Division of Allergy, Immunology and Transplantation at NIAID, emphasized during a news conference held to announce the release of the guidelines that they were not written "by allergists for allergists" but, rather, are intended to be used across medical specialties, including family medicine.
Skin and Blood Tests Not Reliable Indicators
"One of the most concerning issues we see is confusion between the concept of sensitivity and clinical reactivity," said Sampson, who is a past president of the American Academy of Allergy, Asthma and Immunology. "We see a lot of physicians order a large number of blood tests for various foods, and when they find a small amount of antibodies present, they indicate to the individual that they're allergic to foods and shouldn't ingest them."
According to Sampson, this practice leads to many children unnecessarily being put on highly restrictive diets. "When we see them and go through the food challenge process, they don't react to most foods," he said.
"One of the biggest things we'd like to see based on guidelines is that the diagnosis of food allergy isn't just doing a skin test or just doing a blood test or (accepting a patient's or parent's) report of a food allergy."
Instead, Sampson said appropriate diagnosis requires taking a thorough medical history, ordering appropriate lab tests, and, in some cases, conducting an oral food challenge. However, many physicians are reluctant to perform oral food challenges because the process is time-consuming, carries some risk and is not well compensated, he said. Still, the results of such challenges can be illuminating.
Patients' Self-reporting "Wildly Overestimates" Incidence
The guidelines also identify a dozen "nonstandardized and unproven" diagnostic procedures to avoid.
In addition to diagnosis, the guidelines cover several other topics:
- conditions that coexist with food allergies, including asthma and atopic dermatitis;
- risk factors for developing allergies;
- management of individuals at risk for food allergies;
- prevention of food allergies, including recommendations regarding breastfeeding and the use of certain infant formulas;
- prevention and management of nonacute allergic reactions, including recommendations for nutritional counseling and education regarding reading food labels; and
- diagnosis and treatment of acute allergic reactions, including use of epinephrine.
"It's going to be very important for patients to work with their physicians to develop the correct diagnosis so the correct management strategy can be put in place," Fenton said.
The Journal of Allergy and Clinical Immunology: "Guidelines for the Diagnosis and Management of Food Allergy in the United States: Report of the NIAID-Sponsored Expert Panel"
CDC: Food Allergy Among U.S. Children: Trends in Prevalence and Hospitalizations
(8-page PDF; About PDFs)
FDA: Food Allergies: Reducing the Risks
Food Allergy & Anaphylaxis Network