Medically reviewed on August 1, 2022 by Jordan Stachel, M.S., RDN, CPT. To give you technically accurate, evidence-based information, content published on the Everlywell blog is reviewed by credentialed professionals with expertise in medical and bioscience fields.
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Food allergies, such as a peanut allergy, should be taken very seriously. Allergic reactions to food can range from mild symptoms (like eye-watering and lip swelling) to a severe allergic reaction like anaphylaxis, and experts are still researching potential cures. 
If you suspect that you have a food allergy, testing is crucial to managing your diet and preventing reactions.
In this guide, we’ll explore how to test for a food allergy by breaking down what a food allergy test does, whether or not you might need one, the types of tests available, how to prepare for a test, and how to interpret the results of your test. We’ll also explore at-home food allergy testing, a tool that can help you prevent adverse reactions and manage your food allergies from the comfort of your home.
You should seek out food allergy testing if:
Some food allergies produce mild reactions, which can be easily missed. Be mindful of the following common symptoms of an allergic reaction to food, and seek an allergy test if you experience them: 
There are four allergy tests available: 
While oral challenge testing and skin patch testing should always be completed in a controlled environment while supervised by a healthcare provider, elimination dieting and blood testing can be done from home.
But, elimination dieting takes time—experts recommend dedicating at least four weeks for each food you eliminate.  With at-home blood testing, you can collect a finger-prick sample and send it back to a lab for results without having to visit a healthcare provider.
In preparation for a food allergy test, you should avoid all of the following for seven days before the test: 
While an in-office allergy test will be supervised by a healthcare provider who will interpret your results, you can also get help from medical experts if you opt for at-home allergy testing.
At Everlywell, all of our test results include an easy-to-understand guide to your specific reactions. You’ll receive personalized, detailed information about what your results mean for you.
The Everlywell at-home Food Allergy Test lets you check your body’s immunoglobulin E (IgE) reactivity to common food allergens. If your results indicate increased reactivity that may be associated with a food allergy, you will receive a call from a nurse to help with next steps.
How to test for peanut allergy at home: a quick guide
How to know if you have a food allergy
IgG vs. IgE antibodies: understanding the differences