Medically reviewed on August 1, 2022 by Karen Janson, M.D. 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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Few foods capture childhood better than lip-smacking, protein-packed peanut butter and jelly sandwiches. That is, of course, unless you have a nut allergy.
If you’re one of the 6.1 million Americans allergic to the nutritious nut, peanut butter is the less of a childhood snack and more of a lifelong caution. This is especially true if you think you might have a peanut allergy but have yet to take a food allergy test.
Fortunately, we’re here to give you the inside scoop about how to test for a food allergy at home, showing you how testing for a nut allergy can be easier than cutting the crust off a delicious almond butter sandwich.
Like automobiles, radios, and television, food allergy testing has come a long way since its creation in the early 20th century. Dietitians administered the first food allergy test in 1921, which consisted of little more than a blood transfusion.
Since then, food allergy testing has taken many forms, including: 
Now, you can take food allergy tests from the comforts of your own home with at-home lab food allergy tests.
Before diving into how to test for peanut allergy at home, let’s discuss the three types of food-related reactions. That way, you can be sure you’re testing for the right condition. 
Given the potential severity of food allergies, taking a food allergy test rather than a food sensitivity test is crucial if you think you have a peanut allergy.
Most at-home lab food allergy tests follow a similar procedure:
In addition to accurate test results, some food testing kits even provide you with a personalized action plan detailing your next steps.
As stated above, allergy tests and food sensitivity tests both look for the presence of immunoglobulins. However, the specific immunoglobulins they isolate differ based on the test.
While food sensitivity tests look for immunoglobulins such as IgG and IgA, food allergy tests look for immunoglobulin E, also known as IgE. As it turns out, IgE plays a massive role when it comes to peanut allergies.
To understand the role IgE plays, let’s look at the reaction process from start to finish in someone who has a peanut allergy: 
Food allergy tests thus measure IgE antibody levels in the body. Too many IgE antibodies may indicate a food allergy.
While some at-home test kits differ in design, most follow a standard measurement system to provide you with your results.
In short, IgE levels are recorded in units known as kU/L. At-home food allergy tests typically record kU/L levels from 0.10 kU/L to 100 kU/L. This measurement can then be used to determine your level of response to peanut allergens: 
To sum up: the higher your IgE count, the likelier it is that you have a peanut allergy. That said, your IgE levels can only let you know that you might have a peanut allergy. It’s up to your healthcare provider to make a full diagnosis.
Preparing for an at-home test is a relatively straightforward process. All you need to do is follow the steps below to ensure your at-home test goes smoother than the creamiest hazelnut butter.
Monitoring your allergy symptoms is the first step in preparing for your at-home test. That way, you can be sure a food allergy test is warranted.
Tell-tale signs of peanut allergies include: 
If, after being exposed to peanuts, one or more of these allergy symptoms appear, you should take a food allergy test.
You should also take a peanut allergy test even if you suspect you have a peanut allergy. You don’t want to wait until you have a potentially life-threatening reaction to learn you have a peanut allergy.
We’ve already provided an overview of how at-home tests work, but you should still read the directions for your specific test. That’s because some tests may differ in terms of sample collection methods and other procedures.
You should also note all components included in your kit. Here are several common test kit components:
If you’re using an at-home lab test, your kit also likely includes a prepaid return shipping label. This makes it easy to get your sample where it needs to go.
Increasing your blood flow is not only vital for a successful workout, but also for a successful at-home food allergy test.
That’s because an increased blood flow allows you to collect the right sample amount for analysis.
To increase your blood flow before taking your test, do the following:
Properly disinfecting your finger and collection area helps ensure an uncontaminated sample. To sanitize your finger and collection area, do the following:
Proper sanitation also means cleaning your area post sample collection.
From spicy Thai dishes to good old-fashioned peanut butter and jelly sandwiches, many delicious foods and products contain peanuts. But if you have a peanut allergy, they shouldn’t be found in you. Knowing if you have a peanut allergy is thus essential to maintaining your health.
That’s why we’re here.
Designed for people who’ve experienced mild food reactions or have a family history of food allergies, our Food Allergy Test looks for nine IgE antibodies linked to common food allergies. All you need to do is prick your finger, send us your sample, and let us take it from there.
From the first prick to the final action plan, we’ll be with you every step of the way.