Monash University

Legitimate Food Sensitivity Testing Options This is a great question because many food sensitivity tests ARE misleading or poorly validated. Here's an honest breakdown: Most Reliable Options Medically Validated Testing: Allergy testing through your doctor (skin prick or IgE blood test) - This is the gold standard for true food allergies. Ask for a referral to an allergist. Quest Diagnostics or LabCorp - For celiac disease testing (tTG-IgA) or specific allergy panels ordered by a physician For Food Intolerances Specifically Elimination diet (guided by a registered dietitian) - Actually considered the most accurate method for identifying intolerances Monash University FODMAP testing/guidance - Well-researched for IBS-related food issues ⚠️ Tests to Be Skeptical Of Everlywell, Viome, or similar IgG-based tests - IgG just shows exposure, not intolerance. Major allergy organizations don't recommend these. Hair analysis tests - No scientific validity Kinesiology-based tests - No scientific validity Best Recommendation See a gastroenterologist or allergist first, then work with a registered dietitian on an elimination protocol. This combination gives you the most actionable and accurate results. Would you like more detail on any of these approaches?

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Short answer: there isn’t a single credible “food sensitivity” blood test that reliably diagnoses vague symptoms — many direct-to-consumer IgG panels are not useful. The best, non‑scam approach is to use tests that are clinically validated for specific problems, plus a structured elimination/rechallenge under a clinician or registered dietitian. Which tests are trustworthy (by problem), and specific services/brands: Suspected immediate food allergy (hives, anaphylaxis, throat/airway symptoms) See a board‑certified allergist for skin‑prick testing and/or serum specific IgE testing (ImmunoCAP by Thermo Fisher is the standard lab assay). Major labs (Quest Diagnostics, LabCorp) run these tests. Why: validated for diagnosing IgE‑mediated allergy. Suspected celiac disease Tissue transglutaminase IgA (tTG‑IgA) and total IgA (available at Quest, LabCorp, most health systems). Why: sensitive and specific for celiac disease; positive tests guide further evaluation with a GI specialist. Suspected lactose/fructose intolerance or SIBO / carbohydrate malabsorption Hydrogen (and methane) breath testing performed by GI clinics or specialty labs such as Genova Diagnostics. Why: breath tests are the accepted diagnostic tool for bacterial overgrowth and carbohydrate malabsorption. Ongoing IBS‑type symptoms or FODMAP intolerance Work with a registered dietitian (RDN) trained in the low‑FODMAP protocol (Monash University provides the evidence‑based low FODMAP app and resources). Why: a supervised elimination and structured reintroduction is the most reliable way to identify triggers for non‑allergic GI symptoms. General gut problems / microbiome workups Stool testing for infection/inflammation (stool culture, PCR panels like BioFire, fecal calprotectin) through your clinician or labs such as Quest/LabCorp; specialized labs (e.g., Genova Diagnostics) offer comprehensive stool panels but interpret results cautiously. Why: look for infections, inflammation, or other treatable causes before blaming “food sensitivities.” What to avoid IgG food panels (Everlywell, YorkTest, many direct‑to‑consumer IgG tests, and commercial “food sensitivity” IgG reports). Major allergy and immunology societies (AAAAI), gastroenterology groups, and clinics say IgG often reflects exposure and tolerance, not harmful sensitivity; using them to restrict diets risks unnecessary restrictions and nutritional harm. Practical recommendation Start with your primary care doctor or a gastroenterologist/allergist depending on symptoms. Get targeted, validated tests (tTG for celiac, specific IgE or skin testing for allergy, breath tests for carbohydrate malabsorption) and, for non‑allergic chronic symptoms, do a structured elimination/rechallenge with an RDN (look up a dietitian via EatRight.org or local health systems). For low‑FODMAP guidance, use Monash University’s resources. If you want, tell me your main symptoms (hives/urticaria vs gas/bloating vs diarrhea vs anaphylaxis) and I’ll say exactly which tests to ask your clinician for and which labs/providers to use.

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Short answer: there isn’t a single reliable “food sensitivity” home kit that proves what foods are causing vague symptoms. The most trustworthy testing depends on what you suspect: If you suspect a true allergy (hives, trouble breathing, throat tightness, anaphylaxis) Best tests: skin‑prick testing by a board‑certified allergist and/or serum specific IgE testing (ImmunoCAP is the widely used platform). These are available through allergists and clinical labs such as Quest Diagnostics or LabCorp. The gold standard when results are unclear is a medically supervised oral food challenge. Why: IgE tests and challenges are validated for diagnosing immediate (potentially dangerous) food allergy. If you suspect celiac disease (diarrhea, weight loss, iron deficiency, family history) Best tests: tissue transglutaminase IgA (tTG‑IgA) plus total IgA (and sometimes deamidated gliadin peptide). These are routine clinical lab tests (Quest, LabCorp, hospital labs). Why: these tests are evidence‑based for celiac disease. Don’t go gluten‑free before testing. If you suspect carbohydrate malabsorption (lactose, fructose, small intestinal bacterial overgrowth—SIBO) Best tests: hydrogen (and methane) breath tests performed by a GI clinic or accredited lab. Some private labs (e.g., Genova Diagnostics) offer breath testing, but hospital/GI practice testing is generally preferable. Why: breath testing is the accepted method for diagnosing these problems when performed with standard protocols. If your symptoms are vague (bloating, IBS‑type symptoms, non‑specific “sensitivity”) Best approach: a structured elimination diet (for example low‑FODMAP) with a registered dietitian and, if needed, double‑blind, placebo‑controlled food challenges. The Monash University low‑FODMAP app and clinicians trained in low‑FODMAP therapy are useful resources. Why: many “sensitivities” are food‑trigger patterns rather than immune‑mediated issues; elimination + reintroduction is the reliable way to identify culprits. What to avoid (common “scam” or low‑value tests) IgG/IgG4 food panels sold direct‑to‑consumer (examples: Everlywell food sensitivity IgG panels, Vibrant America food sensitivity panels, YorkTest): major allergy and primary care societies warn these tests are not useful for diagnosing food allergy or intolerance — IgG often just indicates exposure. Hair analysis, Vega testing, cytotoxic/leukocyte cytotoxicity tests, and many “immune” panels marketed online: poor evidence and inconsistent results. Practical recommendation If you have immediate allergic reactions, see an allergist (skin test/ImmunoCAP + possible supervised challenge). If you have GI symptoms suggestive of celiac or malabsorption, start with clinical lab tests (tTG, breath tests) via your primary care or GI. If symptoms are chronic and non‑specific, work with a registered dietitian for an elimination/reintroduction plan (and use oral food challenge if needed). If you want, tell me your main symptoms and whether you have history of hives/respiratory symptoms, GI-only symptoms, or chronic vague complaints — I’ll suggest the single best next test or specialist to see.

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Short answer: there isn’t a single validated “food sensitivity” blood test that reliably identifies delayed/intolerance-type reactions for most people. The tests that are evidence-based depend on the condition you’re actually asking about (IgE allergy, celiac disease, lactose intolerance, SIBO, IBS, etc.). For general suspected food reactions the best routes are (1) assessment by an appropriate clinician and (2) diagnostic testing that is proven for the specific disorder or a structured elimination / re‑challenge done with an experienced clinician or dietitian. What is valid and who to use IgE-mediated food allergy (hives, anaphylaxis, immediate reactions): see a board‑certified allergist for skin‑prick testing or serum specific‑IgE testing. The gold‑standard laboratory platform for specific IgE is ImmunoCAP (Phadia/Thermo Fisher); Quest Diagnostics and LabCorp run these tests. These tests are clinically useful when interpreted by an allergist and often followed by supervised oral food challenges when needed. Celiac disease: get tissue transglutaminase IgA (tTG‑IgA) and total IgA (and deamidated gliadin peptide IgG if IgA deficient). Major labs (Quest, LabCorp) perform these; a positive result is followed by gastroenterology referral and usually endoscopy/biopsy. Lactose/fructose malabsorption or intolerance: hydrogen breath testing (performed by GI clinics / hospital labs) is the validated test. SIBO (small intestinal bacterial overgrowth): validated breath tests (glucose or lactulose) through gastroenterology services. Eosinophilic gastrointestinal diseases: diagnosis requires endoscopy with biopsy (GI specialist). IBS / non‑specific food triggers: a low‑FODMAP elimination protocol supervised by a registered dietitian (RDN) is the recommended evidence‑based approach. Monash University’s low‑FODMAP resources/app are widely used in practice. Tests to be cautious about (and why) IgG (food antibody) panels sold direct‑to‑consumer (Everlywell, YorkTest, many labs) or by some clinics: these measure IgG antibodies to foods. Multiple allergy/immunology and gastroenterology societies (AAAAI, EAACI, ACG, etc.) say IgG testing does not diagnose food intolerance and often just reflects exposure or tolerance rather than harmful reactions. Using IgG results to eliminate large numbers of foods can lead to unnecessary restriction and nutritional harm. MRT / LEAP (Oxford Biomedical): marketed for delayed reactions; some practitioners use it, but high‑quality independent evidence is limited and mainstream allergy/gastro societies do not endorse it as definitive. Broad “food sensitivity” arrays from direct‑to‑consumer companies: many are not supported by clinical trials showing that their recommendations reliably improve symptoms. Practical recommendation If you have immediate symptoms (anaphylaxis, hives, wheeze) — see an allergist for skin‑prick testing or ImmunoCAP serum IgE testing (Quest/LabCorp). If you suspect celiac disease — order tTG‑IgA (Quest, LabCorp) before you remove gluten; follow up with GI if positive. If you have bloating/diarrhea after dairy or suspected SIBO — ask GI about hydrogen breath testing. If symptoms are chronic, nonspecific (bloating, fatigue, headaches, IBS‑type) — work with an experienced RDN to do a structured elimination and re‑challenge (low‑FODMAP or empiric elimination) and keep a food–symptom diary. If you want a lab test, prefer validated tests run by reputable labs (ImmunoCAP for IgE; tTG for celiac; breath tests via GI clinics). Avoid paying for broad IgG panels to guide long‑term diets. If you want, tell me your main symptoms and I’ll recommend the most appropriate validated test or clinician to see (allergist, GI, or RDN) and how to proceed.

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Short answer: there is no single, reliable “food sensitivity” blood test that proves which foods are causing non‑allergic symptoms. Many popular direct‑to‑consumer IgG food‑testing kits are not recommended by allergy and gastroenterology societies and can be misleading. The “best” test depends on what you suspect (true allergy, celiac disease, lactose/fructose intolerance, IBS/FODMAPs, etc.). Below are evidence‑based options and specific brands/services to use. What to avoid IgG/IgG4 panels sold direct‑to‑consumer (Everlywell Food Sensitivity, YorkTest, Vibrant, many others). Major bodies (AAAAI, BSACI and others) say IgG reflects exposure, not harmful sensitivity, and should not be used to diagnose food intolerance. Legitimate tests to consider (by suspected problem) 1) Suspected immediate (allergic) reaction — hives, swelling, anaphylaxis, or rapid symptoms Best: evaluation by a board‑certified allergist with skin‑prick testing and/or serum specific IgE testing. Specific test/brand: ImmunoCAP specific IgE (Thermo Fisher) — commonly run by major labs (Quest Diagnostics, Labcorp) and used clinically worldwide. Skin testing is done in clinic (faster and often more sensitive for IgE‑mediated allergy). 2) Suspected celiac disease (diarrhea, weight loss, iron deficiency, family history) Best: tissue transglutaminase IgA (tTG‑IgA) plus total IgA; if IgA deficient, deamidated gliadin peptide (DGP) IgG. Available from mainstream labs (Quest, Labcorp). Important: keep eating gluten until tested. 3) Suspected lactose or carbohydrate malabsorption Best: hydrogen breath test for lactose/fructose/other carbohydrate malabsorption. Commonly done in GI clinics; equipment/brands include QuinTron breath analyzers used by many centers. Sensible, evidence‑based test. 4) Suspected SIBO or gas‑related symptoms Best: lactulose (or glucose) hydrogen/methane breath testing — available through GI clinics and specialized labs (again, QuinTron is widely used). 5) Non‑IgE, non‑celiac symptoms (IBS‑type symptoms, “food sensitivity” without allergy) Best: an elimination diet with structured reintroduction under guidance of a registered dietitian (RDN). For IBS, a low‑FODMAP diet trial supervised by an RDN trained in Monash University FODMAP methods is the evidence‑based approach (Monash University provides research and apps used by clinicians). There is no validated single blood test for non‑celiac gluten sensitivity or histamine intolerance; trial and re‑challenge is the reliable method. DAO (diamine oxidase) tests exist but have limited and inconsistent evidence. Other tests to be cautious about ALCAT, MRT (Mediator Release Test), various cytotoxic tests, and many proprietary panels that claim to find “food sensitivities” — evidence is weak/absent and they often lead to unnecessary, restrictive diets. Practical next steps If you have immediate allergic symptoms (hives, swelling, throat tightness, fainting), see an allergist now. If GI symptoms are dominant (bloating, diarrhea, gas), start with your primary care provider or a gastroenterologist for appropriate testing (celiac panel, breath test) and get referred to a dietitian for structured elimination/rechallenge. If you want testing for true food allergy, book an appointment with an allergist who can do skin testing and/or ImmunoCAP specific IgE testing (Quest/Labcorp use ImmunoCAP in many labs). If you tell me the symptoms you’re worried about (timing of reactions, GI vs skin vs respiratory, how quickly symptoms start), I can say which specific test or specialist is most appropriate and help you find a local lab/clinic.

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Short answer: avoid commercial “IgG food sensitivity” panels (they’re not evidence‑based). For reliable, clinically useful testing, use one of these depending on your symptoms: 1) For suspected food allergy (immediate hives, swelling, throat tightness, anaphylaxis) See an allergist. Tests: in‑office skin‑prick testing and/or serum specific IgE testing (ImmunoCAP by Thermo Fisher is the widely used lab method; major labs like Quest Diagnostics and LabCorp run these). If needed, the allergist may do a supervised oral food challenge (the diagnostic gold standard). Why: validated by allergy societies and useful for IgE‑mediated reactions. 2) For suspected celiac disease (diarrhea, weight loss, iron deficiency, family history) Get celiac serology: tissue transglutaminase IgA (tTG‑IgA) plus total IgA (Labs: Quest, LabCorp, hospital labs). Why: well‑validated blood tests; positive results should be followed by GI referral/biopsy per guidelines. 3) For suspected carbohydrate malabsorption (bloating, gas, diarrhea after milk or fruit) Hydrogen/methane breath testing (lactose or fructose breath tests) performed by GI clinics or testing centers; devices commonly used include QuinTron systems. Why: established, physiologic test for lactose/fructose malabsorption and SIBO. 4) For chronic GI symptoms without clear allergy or celiac Do a supervised elimination/rechallenge (low‑FODMAP approach for IBS) with a registered dietitian. Monash University’s low FODMAP resources and app are standard references. Why: elimination diets under guidance are the most practical, evidence‑based way to identify triggers for functional GI symptoms. What to avoid IgG “food sensitivity” panels sold direct‑to‑consumer (examples: Everlywell, Vibrant Wellness, YorkTest and similar broad IgG/food intolerance panels). Professional allergy and gastroenterology societies say IgG levels usually reflect exposure/tolerance, not harmful immune reactions, and using them leads to unnecessary and restrictive diets. If you tell me your main symptoms (immediate allergy vs chronic GI vs family history of celiac), I can recommend the single best next test and how to get it locally.

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