Medically reviewed on June 14, 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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Many people can spend months (even years) trying to understand which foods trigger responses like rashes and stomach rumbles. So, if you decide to examine your reactivities to foods with an IgG food sensitivity panel, it’s important to understand the results—and your next steps.
Here’s our guide to IgG food test results interpretation (for IgG testing from the convenience of home, try the Everlywell Food Sensitivity Test).
Before reading any IgG test results, you should know just what role IgG plays in the body’s digestion and how it factors into a food sensitivity test.
IgG, or immunoglobulin G, is an antibody released by the immune system. If the body perceives this food as dangerous, it will release IgG antibodies to “fight off” the particles, creating a food sensitivity.
Unfortunately, this immune response often triggers uncomfortable symptoms that can pop up hours after eating . Typical symptoms can include:
If you can’t determine which foods your body is sensitive to, taking an IgG food antibody assessment can help you decide which foods to prioritize in a two-part elimination diet.
While each licensed testing lab may have slightly different procedures, most follow the same IgG testing protocol. Testing steps include :
Once you receive the results, you can see if your body has an atypical IgG reaction to a particular food that may be behind symptoms you experience. Trying an elimination diet and add-back challenge for specific foods is an option before permanently altering one's diet.
At first, IgG test results may look a little confusing. To interpret them, you just need to understand the IgG reaction scale.
Test results will give each tested food a “score”. This score refers to the blood’s IgG levels in reaction to that food, often ranked numerically as well as across:
Just remember—symptoms do not always align with IgG test results. You might eat eggs every day in peace but receive a “high reactivity” score for eggs. Likewise, you may always get stomach cramps after eating dairy, but your test may show no IgG elevation for dairy. Ultimately, it’s important to pair your test results with a temporary elimination diet to determine what specific foods you’re sensitive to.
So, you’ve read your results and checked them twice. Now, what do you do?
After you receive IgG results, it’s time to put the results to work with a temporary elimination diet.
Temporary elimination diets remove and reintroduce potentially problematic foods from the diet to see if you still experience symptoms. Thanks to the IgG food sensitivity test results, you’ll have a pretty good idea of which foods to eliminate first in a temporary elimination diet.
The process can look something like this:
Food sensitivity testing can help you learn which foods you may want to prioritize for a two-part elimination diet. If you’re facing chronic digestive pain or have experienced a severe allergic reaction, consider taking the first step toward finding a solution with the Everlywell Food Sensitivity Test.
Dairy alternatives to consider for dairy-related issues
IgG vs. IgE antibodies: understanding the differences
1. Food Allergy vs. Food Intolerance: Symptoms, Causes & Prevention. Cleveland Clinic. URL. Accessed June 14, 2022.
2. Lavine E. Blood testing for sensitivity, allergy or intolerance to food. CMAJ. 2012;184(6):666-668.