Food intolerance tests: what actually works
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What is actually validated, and what it costs
Each of these tests one mechanism. None of them tests "intolerance" in general, because that is not a thing a laboratory can measure.
| Test | What it detects | Typical US cost | How to get it |
|---|---|---|---|
| Celiac serology (tTG-IgA) | Celiac disease, an autoimmune condition, not an intolerance | Ordinary blood test, usually covered when clinically indicated | GP or gastroenterologist. You must still be eating gluten |
| Lactose hydrogen breath test | Lactose malabsorption | Commonly low hundreds; reported from about $80 self-pay to $200-500. Often insured | GI clinic, or an at-home kit posted to a lab |
| Fructose hydrogen breath test | Fructose malabsorption | Similar to the above | GI clinic or at-home kit |
| Specific IgE / skin prick | True food allergy, which is a different condition entirely | Usually covered when there is a clinical reason | Allergist. See allergy vs intolerance |
| Fecal calprotectin | Gut inflammation, which points to IBD rather than intolerance | Modest, usually covered when indicated | GP or gastroenterologist |
Costs vary enormously by country, insurer and clinic, and change over time. Treat these as orders of magnitude and confirm with the provider. Checked September 2026.
What is sold as a food intolerance test, and is not one
The large majority of direct-to-consumer "food intolerance" or "food sensitivity" kits measure IgG antibodies to a panel of foods. The problem is not accuracy in the laboratory sense; the assay measures what it says it measures. The problem is what the result means. IgG to a food indicates exposure, and on the current understanding IgG4 in particular is associated with developing tolerance. So a strong "positive" frequently marks a food you eat often and digest perfectly well, which is also why the results feel uncannily plausible: they list the things you actually eat.
Several allergy and immunology bodies advise against using these panels to diagnose food intolerance. The practical harm is not the money. It is that people remove eight or ten foods on the strength of a printout, feel better for a fortnight through expectation and dietary change in general, and then never reintroduce, ending up on a needlessly narrow diet with no more knowledge than they started with. Our detailed review, with sources, is at are IgG food intolerance tests accurate.
The same reasoning applies to leukocyte activation and cytotoxic tests, hair analysis, applied kinesiology and electrodermal testing. Consumer microbiome panels are a separate case and are reviewed separately.
A sensible order, if you are going to spend money
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Rule out the treatable conditions first
Celiac serology while you are still eating gluten, and fecal calprotectin. Both are cheap relative to a consumer panel, both are usually covered, and both change everything if positive. Doing months of dietary detective work on top of undiagnosed celiac disease or IBD is the worst outcome available here. The five tests worth doing.
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Test a specific mechanism only if you have a specific suspicion
A lactose breath test is worth it if dairy is a recurring suspect. It is not worth it as a general fishing expedition, and neither is a SIBO breath test. What SIBO testing can and cannot tell you.
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Then demonstrate it, rather than buying a list
A food counts as a trigger if it produces symptoms repeatedly, more often than your own background rate, across several separate exposures with gaps between them. That is a demonstration, and it is the one thing no panel can do for you. Our free diary sheet and reintroduction planner set it up with no app required.
Before any of this: the symptoms that mean stop
Blood in your stool, unintended weight loss, difficulty swallowing, persistent vomiting, fever alongside gut symptoms, or a new persistent change in bowel habit from around age 50. None of those are a testing question. The full red flag list.
Minthe is a wellness and self-tracking tool, not a medical device. It does not diagnose or treat any condition and isn't a substitute for professional medical advice. If you have red-flag symptoms such as blood in your stool, unintentional weight loss, difficulty swallowing, persistent vomiting or a fever alongside gut symptoms, see a clinician rather than tracking them.
Sources
- Rezaie A, et al. Hydrogen and Methane-Based Breath Testing in Gastrointestinal Disorders: The North American Consensus. American Journal of Gastroenterology, 2017;112(5):775-784. PubMed
- Santos AF, et al. EAACI guidelines on the management of IgE-mediated food allergy. Allergy, 2025;80(1):14-36. PubMed
Frequently asked
Is there a test for food intolerance?
Not a general one, and this is the single most important thing to understand before spending money. There is no validated test that takes a blood sample and returns a list of foods you are intolerant to. What exists are tests for specific named conditions: celiac disease, lactose malabsorption, fructose malabsorption, and true IgE food allergy. Each tests one mechanism. Anything marketed as a broad "food intolerance panel" covering 100 or 200 foods is not measuring intolerance.
How much does a food intolerance test cost?
It depends entirely on which test. Celiac serology is an ordinary blood test, inexpensive, and usually covered by insurance or your health service when there is a clinical reason. Hydrogen breath tests for lactose or fructose commonly run in the low hundreds of dollars in the US, with reported figures ranging from around $80 self-pay at some clinics to roughly $200 to $500, and they are often covered by insurance. Direct-to-consumer IgG "intolerance" panels typically cost around $100 to $300 and are not covered, because they are not clinically indicated. Verify current pricing directly with the provider; this varies enormously by country, insurer and clinic.
Are at-home food intolerance test kits accurate?
The IgG-based ones, which are the large majority of what is sold, are not measuring intolerance. IgG antibodies to a food indicate exposure and, on the current understanding, developing tolerance, so a "positive" often marks a food you eat regularly and tolerate perfectly well. Multiple allergy and immunology societies advise against using them for this purpose. Our full review is at /igg-food-intolerance-tests.
Where can I get a food intolerance test near me?
For the validated ones, through a clinician. Celiac serology needs a blood draw and, critically, you must still be eating gluten when it is taken or the result is unreliable. Hydrogen breath tests are done at gastroenterology clinics, and at-home breath kits mailed back to a laboratory also exist. Both routes normally start with a GP or gastroenterologist, which also gets you the interpretation, and interpretation is most of the value.
What should I do instead of buying a panel?
Two things, in order. First, exclude the conditions that mimic intolerance and are treatable: celiac serology while still eating gluten, and fecal calprotectin for inflammation. Second, if those are clear, run a structured elimination and reintroduction rather than buying a list. A food only counts as a trigger if it produces symptoms repeatedly, against your own background rate, and that is something you demonstrate rather than something a panel can tell you.