Working with Your Doctor
Last reviewed: March 2026
Types of Allergy Specialists
Understanding which type of specialist to see is the first step toward effective food allergy management. An allergist, also called an allergist-immunologist, is a physician who has completed additional fellowship training in allergy and immunology after their residency in internal medicine or pediatrics. Allergists are the primary specialists for diagnosing and managing food allergies, including performing skin prick tests, ordering blood tests, conducting oral food challenges, and prescribing treatments like oral immunotherapy. An immunologist focuses more broadly on immune system disorders but overlaps significantly with allergists, as most allergists are also board-certified immunologists. A gastroenterologist may be involved when food allergies manifest primarily as gastrointestinal symptoms, such as in eosinophilic esophagitis (EoE), food protein-induced enterocolitis syndrome (FPIES), or food protein-induced allergic proctocolitis (FPIAP). Dermatologists may be consulted when food allergies contribute to skin conditions like eczema or chronic hives. For most food allergy patients, the allergist is the quarterback of the care team. Your primary care physician or pediatrician can provide initial evaluation and referrals, but the specialized training of an allergist is essential for accurate diagnosis, appropriate testing, and evidence-based management of food allergies.
Finding the Right Allergist
Not all allergists have the same level of experience with food allergies. Some focus primarily on environmental allergies and asthma, while others specialize in food allergy diagnosis, management, and treatment. When searching for an allergist, start with the professional directories maintained by the American Academy of Allergy, Asthma, and Immunology (AAAAI) at aaaai.org and the American College of Allergy, Asthma, and Immunology (ACAAI) at acaai.org. Both directories allow you to search by location and specialty. Verify that any allergist you are considering is board-certified by the American Board of Allergy and Immunology (ABAI). Board certification indicates that the physician has completed accredited training and passed rigorous examinations. Beyond credentials, consider practical factors: Does the office have experience with your specific allergens? Do they perform oral food challenges in-office? Do they offer treatments like oral immunotherapy if you are interested? What is their after-hours emergency protocol? Ask for recommendations from your pediatrician, other allergy families, local support groups, and online allergy communities. A good allergist should make you feel heard, take your concerns seriously, explain test results clearly, and work collaboratively with you to develop a management plan. If you do not feel comfortable with your allergist, seeking a second opinion or switching providers is entirely appropriate.
Diagnostic Tests Explained
Food allergy diagnosis involves several types of tests, each with different strengths and limitations. Skin prick testing (SPT) is often the first-line diagnostic tool. A small amount of allergen extract is placed on the skin, usually the forearm or back, and the skin is lightly pricked. A raised wheal (bump) within 15 to 20 minutes suggests sensitization to that allergen. SPT is quick, relatively inexpensive, and provides immediate results. However, a positive skin test does not always mean a clinical allergy exists. It indicates sensitization, meaning the body has produced IgE antibodies to that allergen, but sensitization alone does not predict whether eating the food will cause symptoms. Blood tests, specifically allergen-specific serum IgE tests (formerly called RAST tests), measure the level of IgE antibodies in the blood directed against specific allergens. Higher IgE levels generally correlate with a higher probability of clinical allergy, but like skin tests, elevated IgE alone does not confirm an allergy. Component-resolved diagnostics (CRD) represent an advancement in blood testing. Instead of testing for the whole allergen, CRD measures IgE to specific proteins within the allergen. For example, peanut component testing can distinguish between Ara h 2 (associated with higher risk of severe reactions) and Ara h 8 (associated with milder, pollen-related cross-reactivity). This information helps allergists make more precise predictions about reaction severity.
The Oral Food Challenge: Gold Standard of Diagnosis
The oral food challenge (OFC) is considered the gold standard for food allergy diagnosis because it is the only test that definitively determines whether eating a food causes a clinical reaction. During an OFC, the patient consumes gradually increasing amounts of the suspected allergen under close medical supervision, typically in an allergist's office or hospital setting. The challenge usually takes several hours, with doses given at 15- to 30-minute intervals while the medical team monitors for any signs of allergic reaction. If no reaction occurs after the final dose and a subsequent observation period, the food allergy is ruled out, and the patient can begin incorporating the food into their diet. If a reaction does occur, it is treated immediately with appropriate medications, including epinephrine if needed. OFCs are generally safe when performed by experienced allergists in properly equipped settings. Studies show that severe reactions during supervised OFCs are rare and are almost always successfully managed. However, OFCs should never be performed at home due to the risk of anaphylaxis. Your allergist will recommend an OFC when clinical history, skin testing, and blood test results suggest that a true allergy may not exist, or when retesting suggests a child may have outgrown an allergy. Patients should discuss the risks and benefits of OFCs with their allergist and follow all pre-challenge instructions, which typically include avoiding antihistamines for several days before the test.
Understanding Test Results: Sensitization vs. Clinical Allergy
One of the most important concepts in food allergy diagnosis is the distinction between sensitization and clinical allergy. Sensitization means your immune system has produced IgE antibodies against a specific food protein. It is detected through positive skin prick tests or elevated serum IgE levels. However, sensitization does not automatically mean you will have a clinical reaction when you eat the food. Studies have shown that many people who test positive for food allergen sensitization can eat those foods without any symptoms. Clinical allergy, by contrast, means that eating the food actually triggers symptoms, ranging from mild (hives, itching) to severe (anaphylaxis). A clinical allergy is confirmed through a combination of clinical history (documented reactions after eating the food) and, when history is ambiguous, an oral food challenge. This distinction matters enormously because over-reliance on test results without clinical correlation can lead to unnecessary dietary restrictions. The NIAID guidelines explicitly warn against diagnosing food allergies based solely on skin prick tests or IgE levels without considering the patient's clinical history. If you have a positive test but have never reacted to the food, discuss the possibility of an oral food challenge with your allergist. Conversely, if you have a convincing history of reactions but negative test results, your allergist may still diagnose an allergy based on clinical presentation or pursue additional testing.
Preparing for Appointments
Getting the most out of an allergist appointment requires preparation. Before your visit, create a detailed symptom diary that documents every suspected allergic reaction, including the date, time, what was eaten, the quantity consumed, the time between eating and symptom onset, the specific symptoms experienced, their severity, and any treatment administered. Photographs of skin reactions can be valuable evidence. Maintain a food diary for at least two weeks before your appointment, recording everything eaten, including brand names and specific products. Bring a list of all current medications, including over-the-counter antihistamines, as these can affect test results and your allergist may ask you to stop them before testing. Prepare a list of questions in advance. Key questions to ask include: What specific allergens are you testing for, and why? What do my test results mean in terms of actual clinical risk? Should I undergo an oral food challenge? How often should I be retested? Are there any treatments available, such as oral immunotherapy? What should my emergency action plan include? Should I carry one or two epinephrine auto-injectors? What precautionary labels should I follow? When a child is the patient, bring copies of any school 504 plans or emergency plans for the allergist to review and update. If you are seeing a new allergist, request that records from your previous provider be sent in advance so the appointment time can be spent on assessment rather than history-taking.
Oral Immunotherapy (OIT) and Emerging Treatments
Oral immunotherapy (OIT) represents a paradigm shift in food allergy treatment, moving beyond avoidance toward active desensitization. OIT involves consuming gradually increasing doses of the allergen under medical supervision over months, with the goal of raising the threshold at which a reaction occurs. The FDA approved Palforzia, the first standardized OIT product for peanut allergy, in 2020 for patients ages 4 through 17. Palforzia does not cure peanut allergy but raises the reaction threshold, meaning accidental exposures to small amounts of peanut are less likely to cause severe reactions. Many allergists also offer OIT using commercially available food products (non-FDA-approved protocols) for peanut and other allergens. Sublingual immunotherapy (SLIT) is a related approach that involves placing small amounts of allergen extract under the tongue daily. SLIT is less effective than OIT at raising reaction thresholds but has a better safety profile with fewer side effects. It is not yet FDA-approved for food allergies but is used off-label by some allergists. Biologics represent another frontier. Omalizumab (Xolair), an anti-IgE antibody originally approved for asthma, has been studied as both a standalone treatment and an adjunct to OIT for food allergies. In 2024, the FDA approved Xolair for food allergy in patients one year and older, making it the first biologic approved for this indication. It reduces the severity of allergic reactions to accidental exposures across multiple allergens simultaneously. Clinical trials for additional treatments are ongoing, and patients interested in cutting-edge options can search ClinicalTrials.gov for food allergy studies.
When to Get Retested and Second Opinions
Food allergies are not always permanent, and regular retesting can identify when an allergy has been outgrown. Most allergists recommend retesting every one to two years for allergies that are commonly outgrown, including milk, egg, wheat, and soy. For allergies less likely to be outgrown, such as peanut, tree nut, fish, and shellfish, retesting intervals may be longer, typically every two to three years, unless clinical circumstances suggest a change. Retesting usually involves updated blood work (serum IgE levels) and possibly skin prick testing. If IgE levels have declined significantly over time, your allergist may recommend an oral food challenge to determine whether the allergy has resolved. Declining IgE levels do not guarantee the allergy is gone, but they are an encouraging trend that warrants further evaluation. Second opinions are appropriate and encouraged when you are uncertain about a diagnosis, when test results are ambiguous, when you want to explore treatment options that your current allergist does not offer (such as OIT), or when you feel your concerns are not being taken seriously. Food allergy diagnosis and management is nuanced, and different allergists may interpret the same data differently. FARE and the AAAAI both support patients' right to seek additional perspectives on their care.
Telemedicine, Insurance, and Cost Considerations
Access to specialized allergy care varies significantly by geography and insurance coverage. Many rural and underserved areas lack board-certified allergists, forcing patients to travel long distances for care. Telemedicine has expanded access considerably. Virtual consultations allow patients to discuss symptoms, review test results, develop management plans, and receive follow-up care from the comfort of their homes. While procedures like skin prick testing and oral food challenges require in-person visits, much of ongoing allergy management can be conducted effectively via telehealth. Insurance coverage for allergy care also varies widely. Most health insurance plans cover allergist visits, diagnostic testing, and epinephrine prescriptions, but out-of-pocket costs can be substantial. Epinephrine auto-injectors, particularly brand-name EpiPens, can cost hundreds of dollars even with insurance. Generic alternatives and authorized generics are available at lower cost, and patient assistance programs from manufacturers can help offset expenses. OIT and newer treatments like biologics may or may not be covered by insurance, and prior authorization is often required. Ask your allergist's office about insurance verification before beginning any treatment, and explore patient assistance programs if cost is a barrier. Organizations like FARE maintain resources on financial assistance for food allergy management. If your insurance denies coverage for a recommended treatment, ask your allergist to write an appeal letter documenting the medical necessity.
Medical Disclaimer: This information is sourced from peer-reviewed medical literature and authoritative health organizations. It is for educational purposes only and should not replace advice from your healthcare provider. Always consult with a board-certified allergist about your specific condition.