Need to Know: The Essential Guide to Food Allergy Testing

An assortment of allergen foods and fresh produce on a wooden table.
An assortment of allergen foods and fresh produce on a wooden table.

Dealing with stomach aches or rashes after eating certain foods can be confusing. Food allergy testing shines a light on this problem. This guide walks you through the process, making it easier to understand your body’s signals.

Stay informed and read on!

Key Takeaways

  • Food allergies and sensitivities affect how your body reacts to certain foods, with tests like skin prick tests and blood examinations helping doctors pinpoint what causes these reactions.
  • Preparing for a food allergy test involves stopping some medications, sharing your health history, and possibly fasting; this helps ensure the results are accurate.
  • Testing not only identifies allergens but also guides dietary changes or treatments to avoid severe allergic reactions. In some cases, carrying an epinephrine auto-injector becomes necessary for emergencies.
  • Blood Tests for IgE including At-home collection test kits can make testing easier and more accessible.
  • IgE antibodies trigger immediate allergic reactions, whereas IgG antibodies relate to delayed food sensitivities, making it vital to understand the difference for effective management.
  • Functional medicine practitioners recommend specific food sensitivity tests to create personalized nutrition plans aimed at improving health by identifying and eliminating problem foods.

Essentials of Food Allergy Testing

A person sitting at a dining table surrounded by a variety of food items.

Food allergy testing is essential for determining food triggers that cause allergic reactions. Patients should prepare for the test and consider the risks involved.

Purpose and Need for Food Allergy Testing

Identifying and managing food allergies is a critical step to avoid severe allergic reactions, including anaphylaxis. Tests such as skin prick tests and allergy blood tests help doctors figure out which foods trigger your immune system.

This information guides them in recommending the right treatment or dietary changes. If you suffer from conditions like eczema or eosinophilic esophagitis, testing can be especially helpful.


An accurate diagnosis can mean the difference between safety and danger.

Testing for food allergies also supports individuals in understanding their bodies better. Knowing exactly what causes allergic reactions prevents unnecessary avoidance of certain foods and ensures nutritional balance.

For some, it might mean carrying an epinephrine auto-injector for emergencies. Others may learn that they have food sensitivities rather than true allergies, affecting their diet differently.

Preparing for Your Food Allergy Test

After understanding why food allergy testing is essential, the next step involves getting ready for the test itself. Preparation is key to ensure accurate results from your food allergy examination. Here’s how you can prepare:


  1. Schedule a meeting with an allergist. This doctor specializes in allergies and will guide you through the process.
  2. Stop taking certain medications as advised by your allergist before the test because some medicines can affect the test’s outcome.  Mostly, unless absolutely required to prevent anaphylaxis, stopping antihistamines and steroids is important.
  3. Share your full health history with your allergist, including any past allergic reactions or allergy medicine you’ve taken. This information helps them understand your situation better.
  4. For a skin – prick examination, make sure your skin is clear of lotions or creams on the day of testing since these can interfere with test results.
  5. If undergoing a blood examination, with an at-home test kit or in a laboratory, you might need to fast for a few hours beforehand; follow the allergist’s instructions on this.
  6. Wear comfortable clothing to easily access areas like the forearm for skin tests.
  7. Bring a list of foods you suspect might be causing allergies, including any dairy products, nuts like peanuts or tree nuts, wheat, soy, fish, and shellfish since these are common allergens.
  8. Prepare mentally for the possibility of needing an elimination diet after testing to pinpoint specific food intolerances further.
  9. Plan for some downtime after testing in case you experience discomfort like hives or fatigue from exposure to potential allergens during the test.
  10. Arrange for someone to accompany you if an oral challenge test is part of your evaluation, in case you have a severe reaction and require immediate help.

These steps will help make sure that your visit to the allergist is productive and that your tests yield accurate information about what foods may be causing problems for you.

Understanding the Risks of Food Allergy Testing

Food allergy tests, such as skin-prick tests and blood examinations, help identify allergic reactions to foods like peanuts or dairy. These tests are usually safe but carry some risks.

Side effects can range from minor irritations like redness at the test site to more serious conditions. Rarely, testing might trigger a severe allergic reaction known as anaphylaxis.

This reaction demands urgent medical care and can be life-threatening.

Doctors trained in allergies use autoinjectors with epinephrine to manage severe reactions during testing. Patients should discuss their concerns and understand potential outcomes before undergoing any food allergen examination.

Moving ahead, let’s explore how food allergies differ from food sensitivities and why knowing this difference is crucial for proper management and treatment.

Clarifying Food Allergies vs. Food Sensitivities

An assortment of food items highlighting allergen vs sensitivity.

Understanding the Distinction Between Food Allergies and Food Sensitivities

Distinguishing between food allergies and sensitivities is crucial for accurate diagnosis and treatment. IgE plays a central role in triggering food allergies, while IgG is significant in identifying food sensitivities.

The Role of IgE in Food Allergies

Immunoglobulin E (IgE) acts like a guardian in our immune system, especially against food allergies. When someone is allergic to peanuts or any other food, their body sees these foods as invaders.

In response, IgE antibodies get produced in large numbers. These antibodies trigger cells to release chemicals that cause allergy symptoms. For someone with a peanut allergy, even tiny amounts of peanuts can cause reactions ranging from mild hives to life-threatening anaphylaxis.

Blood tests measure IgE levels to find out which foods a person might be allergic to. This helps diagnose specific food allergies accurately. Learning about IgE’s role gives doctors and patients critical information for managing and treating food allergies effectively.


Immune responses are the body’s way of protecting us from what it thinks are threats.

The Significance of IgG in Food Sensitivities

IgG plays a crucial role in food sensitivities as it triggers delayed reactions, affecting up to 20% of people in developed countries. Unlike quick IgE allergies, IgG responses can lead to symptoms that appear later and are often mistaken for other health issues.

This makes testing for food sensitivities essential, particularly when multiple foods are involved. For instance, Mark Hyman advocates blood tests for IgG allergens and recommends eliminating dairy and gluten from the diet for six weeks to identify potential food intolerances.

If relief isn’t felt after cutting out these allergens, it’s suggested to avoid top allergenic foods like corn, eggs, soy, nuts, nightshades, citrus fruits, and yeast for six more weeks before reintroducing them systematically.

The Value of Food Sensitivity Testing

A woman carefully reads food labels at a dining table.

Food sensitivity testing plays a crucial role in identifying specific foods that may be impacting one’s health, particularly when the body reacts to multiple foods. Functional medicine practitioners recommend these tests to establish a tailored nutrition protocol, focusing on individual needs.

Dr. Mark Hyman advocates blood testing for IgG food allergens and advises a dairy- and gluten-free period of six weeks to pinpoint food allergies. Moreover, if no relief is felt after eliminating dairy and gluten, he suggests avoiding the top food allergens altogether as part of an elimination diet strategy.

Dr. Amy Myers also emphasizes the significance of intuition and recommends the Myers Way – an elimination diet aimed at identifying potential triggers among the top 12 foods.

It is advisable to embark on a step-by-step approach through reintroducing top food allergens into one’s diet and noting any reactions meticulously in order to gain insights into potential sensitivities.

This method can unlock essential information about individual dietary needs while navigating through complexities within this realm of healthcare considerations.

Authority to Request Food Allergy and Sensitivity Tests

A physician discussing food allergy testing with a patient in a medical setting.

Physicians, allergists, and healthcare providers have the authority to order food allergy and sensitivity tests. While allergists typically conduct food allergy testing, any physician can request these tests for their patients.

Seeking professional medical care is crucial for anyone with concerns or questions about possible food allergies or sensitivities, as this ensures accurate diagnoses and proper guidance on managing the conditions.

It’s important to consult a healthcare provider before undergoing any diagnostic test related to food allergies or sensitivities.

Preferred Food Sensitivity Tests by Functional Medicine Practitioners

Functional medicine practitioners favor specific food sensitivity tests to identify problem foods. Here are some preferred food sensitivity tests by these professionals:


  1. MRT (Mediator Release Test): This blood test measures your immune system’s responses to various foods and chemicals, identifying the most reactive substances.
  2. ALCAT (Antigen Leukocyte Antibody Test): It examines your immune cells’ reactions to a wide range of food and chemical stimuli, uncovering potential sensitivities.
  3. IgG Food Sensitivity Test: This blood test investigates IgG antibody levels against specific foods, revealing potential food sensitivities that might contribute to health issues.
  4. FIT (Food Inflammation Test): By measuring inflammatory markers in response to multiple foods, this blood test helps identify potential triggers for inflammation and other health concerns.
  5. IBSchek: This stool-based test detects antibodies against toxins produced by certain bacteria in the gut, linking them to certain dietary components and identifying possible sensitivities.
  6. LEAP (Lifestyle Eating and Performance) Testing: Based on MRT results, LEAP provides personalized elimination diet plans designed to alleviate symptoms associated with food sensitivities.

These preferred tests offer comprehensive insights into individual food sensitivities, enabling tailored dietary interventions for improved overall health outcomes.

Continue reading the next section “7. Decoding the Results of Food Allergy Tests.”

Decoding the Results of Food Allergy Tests

Transitioning from the preferred food sensitivity tests, decoding the results of food allergy tests plays a crucial role in understanding an individual’s reaction to specific foods.

The process involves interpreting the outcomes of allergy tests to identify potential allergens accurately. Allergy blood tests measure IgE antibodies to pinpoint specific allergens triggering immune responses in the body.

Skin prick tests involve introducing small amounts of suspected allergens into the skin through tiny pricks, observing any adverse reactions indicating allergies.

Interpreting food allergy test results requires a comprehensive understanding of IgE antibody levels and skin reaction sizes. Typically, larger wheals or flare-ups on skin prick tests and higher levels of IgE antibodies indicate potential food allergies.

Decoding these results empowers healthcare providers with valuable information for crafting personalized treatment plans and dietary guidelines tailored towards avoiding allergic triggers.

Understanding these test outcomes is essential for effectively managing and mitigating allergic reactions caused by certain foods.


Understanding the complexities of food allergy testing is crucial for accurate diagnosis and treatment. Identifying true allergies versus sensitivities is essential for tailored care.

Testing methods such as skin prick tests and blood tests underpin effective diagnosis, informing personalized management plans. Approaching food allergy testing with this knowledge empowers individuals to take control of their health and well-being.


1. What is a food allergy?

A food allergy happens when your immune system reacts badly to certain foods, causing problems like diarrhea, nausea, or even life-threatening reactions like anaphylactic shock.

2. How do doctors test for food allergies?

Doctors can use several methods to test for food allergies including skin patch testing, checking for immunoglobulin E (IgE) antibodies in your blood, and trying elimination diets to see which foods cause issues.

3. Can you have an allergy to any type of food?

Yes, people can be allergic to many types of foods but some common ones include peanuts (arachis hypogaea), dairy products due to lactose intolerance or milk allergy, gluten found in wheat and rye for those with celiac disease or non-celiac gluten sensitivity.

4. What’s the difference between a food allergy and a food intolerance?

A true allergy involves the immune system and can lead to severe reactions like anaphylactic shock. Food intolerance, such as lactose intolerance or irritable bowel syndrome (IBS), usually affects digestion and is less severe.

5. Are there treatments available for food allergies?

Yes! Avoiding allergenic foods is key; however, medications like epinephrine auto-injectors may be prescribed for serious cases. For some conditions like oral allergy syndrome linked with seasonal allergies, taking allergy medication might help too.

6. Where can I find reliable information on managing my food allergies?

Reliable sources include the National Institutes of Health (NIH), Merck Manual online medical library, American Academy of Allergy Asthma & Immunology websites along with university hospitals such as UW Health at the University of Wisconsin Hospitals and Clinics Authority.


Maulik Shah

Hello. I am a Clinical Geneticist. My medical education is from the Medical College of Virginia (M.D. and Ph.D.). I worked at NIH in the lab that performed the very first human gene therapy trial and helped design some of the original recombinant adenovirus vectors for gene therapy. Since then, I have been a genetics research in both Academia and the Private sector and currently work as Lab Director for Applied InGENuity and QUASR Diagnostics

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