Short answer: IgG food "sensitivity" panels measure IgG antibodies to foods — not a validated diagnosis of allergy or intolerance. The American Academy of Allergy, Asthma & Immunology (AAAAI) states this testing has never been scientifically proven to do what it claims and recommends against using IgG testing to diagnose food allergies or intolerances/sensitivities.
These kits are widely sold in the home-testing market. The specialty-society position is unambiguous — and consumers deserve that honesty before eliminating dozens of foods.
What IgG Food Panels Actually Measure
IgG is an antibody class involved in many normal immune responses. AAAAI explains that the presence of IgG is likely a normal response to food exposure, and that higher levels of IgG4 to foods may simply be associated with tolerance to those foods — not proof that a food is harmful.[1] A colorful "avoid these foods" report is not the same as a clinically validated disease marker.
AAAAI and Choosing Wisely: Do Not Use IgG for This
AAAAI's public guidance says IgG food panel testing has never been scientifically proven to accomplish what it reports to do, and that organizations including AAAAI and the Canadian Society of Allergy and Clinical Immunology recommend against using IgG testing to diagnose food allergies or food intolerances/sensitivities.[1] AAAAI's Choosing Wisely recommendation is equally direct: do not perform unproven diagnostic tests such as immunoglobulin G (IgG) testing in the evaluation of allergy — specific IgG testing is not a test for an allergic condition.[2]
RENVA's read of the specialty guidance: IgG food sensitivity panels are not clinically validated for diagnosing food allergy or intolerance. We are not softening that finding.
How This Differs from True Food Allergy Testing (IgE)
IgE-mediated food allergy is evaluated with clinical history plus targeted IgE blood testing or skin testing — not indiscriminate panels — and often oral food challenges when needed.[2] Choosing Wisely warns that indiscriminate IgE batteries also mislead; testing must be guided by history.[2] IgG panels are a different, unsupported pathway that can drive unnecessary restriction.
What Someone Should Realistically Expect
Expect a list of foods with elevated IgG. Do not expect a reliable map of which foods cause bloating, fatigue, or eczema. AAAAI notes that severely altering diet based on unproven tests can be frustrating and potentially harmful; an allergist/immunologist can help diagnose and manage conditions with evidence-based methods.[1]
Bottom Line
If you have concerning food reactions, seek allergy/immunology or GI evaluation. Do not treat an IgG consumer panel as a diagnosis.
Sources
Frequently Asked Questions
Is an IgG food test the same as an allergy test?
No. Allergy evaluation relies on history and IgE-based testing (or challenges) when indicated. AAAAI states IgG testing is not appropriate for diagnosing food allergy or intolerance.[1][2]
Why do so many companies sell IgG panels?
Consumer demand for answers is high. Specialty guidance still recommends against the test because it lacks scientific validation for the claimed uses.[1]
Could IgG results mean I tolerate the food?
AAAAI notes IgG — particularly IgG4 — may reflect normal exposure and even tolerance, which is the opposite of how many reports are marketed.[1]