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Food Allergy
IgG Food Sensitivity Tests: What the Results Do and Do Not Mean
A food IgG panel does not diagnose food allergy or reliably tell you which foods to remove for bloating, fatigue, or other symptoms. IgG may reflect ordinary exposure to food. If you already bought a panel, the result can still help start a conversation about your symptoms, but it should not become a long elimination diet by itself.
What the result can and cannot answer
| Question | Better approach |
|---|---|
| “Am I at risk of an immediate allergic reaction?” | Review the exact reaction history; an allergist may select specific-IgE testing or a supervised challenge |
| “Why do I bloat after meals?” | Review portions, timing, digestive symptoms, and possible intolerance with a clinician |
| “Do I have to remove every positive food?” | No. IgG positivity does not establish harmful sensitivity |
| “Can I test a food at home after a severe reaction?” | No. Seek an allergy evaluation and follow your emergency plan |
AAAAI recommends against IgG testing to diagnose food allergy or intolerance. Broad restriction based on a panel can make eating stressful and reduce nutrition, especially for a child. If many foods have been removed, ask for help rebuilding a safe diet rather than adding more exclusions.
Describe the symptom instead of the test label
Write down the exact food, amount, time to symptoms, symptom type, and whether the same reaction happened again. Immediate hives, wheeze, vomiting, or dizziness after a specific food is a different problem from gas or abdominal discomfort many hours later. Other conditions may cause chronic digestive symptoms and require a different clinician or test. A targeted history sometimes suggests lactose intolerance, celiac disease evaluation, reflux, or another gastrointestinal issue. Do not start a gluten-free diet before discussing celiac testing if celiac disease is a concern; removing gluten can affect the test. An allergist can advise whether a food-specific allergy evaluation is warranted.
Safety first
If you have had throat symptoms, breathing trouble, faintness, or a rapid multi-system reaction after food, avoid that food until assessed and follow an established emergency plan. An IgG panel should never override a convincing severe reaction history or be used to decide whether emergency medicine is needed.
Does a high IgG value mean I tolerate the food?
It may reflect exposure, but the number is not a clinical clearance to eat a food after a suspected severe reaction. Review that history separately.
If you already removed half your diet
Bring the IgG report and a list of foods you stopped eating, but lead with what symptoms prompted the purchase. If you have been avoiding many foods for months, ask about nutritional assessment and a stepwise, safe reintroduction plan where appropriate. Do not reintroduce a food that caused a convincing immediate severe reaction without specialist advice. For a child, restrictive eating can affect growth and social life, so discuss it early. The clinician may separate three questions: Is there immediate allergy? Is there a digestive intolerance? Is there another condition? Each has a different evaluation. A broad IgG printout cannot answer all three, regardless of how precise its numbers appear.
Sources
- AAAAI: The myth of IgG food panel testing
- AAAAI: Allergy testing
