YorkTest

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 isn’t a single reliable “food sensitivity” blood test that proves foods are causing vague symptoms. Tests that are evidence‑based depend on what you mean by “sensitivity.” For accurate, clinically useful testing, see an allergist or gastroenterologist and use these validated tests/procedures rather than consumer IgG panels. What is evidence‑based (and when to use it) Immediate (allergic) reactions — hives, swelling, throat tightness, anaphylaxis: Skin‑prick testing by a board‑certified allergist and/or serum specific IgE testing (ImmunoCAP/Phadia by Thermo Fisher via labs such as Quest or LabCorp). These are the appropriate, validated tests for IgE‑mediated food allergy. Celiac disease (gluten‑related autoimmune disease): Tissue transglutaminase IgA (tTG‑IgA) plus total IgA (and sometimes EMA or HLA DQ2/DQ8). Available at major clinical labs (Quest, LabCorp). Don’t start a gluten‑free diet before testing. Carbohydrate intolerances: Lactose, fructose, small intestinal bacterial overgrowth: hydrogen/methane breath tests performed by GI clinics (standard clinical breath testing equipment such as QuinTron analyzers are commonly used in practice). Non‑IgE, delayed reactions or “intolerances”: The best approach is a medically supervised elimination diet followed by structured re‑introduction and, if needed, a supervised oral food challenge (single‑ or double‑blind). Double‑blind placebo‑controlled food challenge (DBPCFC) is the research gold standard and the clinical oral food challenge is the practical standard. What to avoid (the “scam” tests) IgG or IgG4 food panels sold direct‑to‑consumer (Everlywell, Vibrant Wellness / Vibrant America, YorkTest, 5Strands, many others). Major allergy societies (AAAAI, EAACI) and expert reviews conclude IgG food testing is not reliable for diagnosing food intolerances or allergies — positive IgG usually just indicates exposure, not disease. Using these tests often leads to unnecessary, overly restrictive diets. Practical recommendation (stepwise) If you’ve had immediate allergic symptoms or anaphylaxis: see an allergist now for skin testing and/or ImmunoCAP specific IgE testing. If you have chronic GI symptoms (bloating, diarrhea, IBS‑type): see a gastroenterologist. Consider hydrogen breath testing for lactose/fructose/SIBO and testing for celiac (tTG‑IgA via LabCorp/Quest). For diffuse, unclear “sensitivity” (fatigue, headaches, skin problems without clear allergy): work with a registered dietitian (RD) experienced in food reactions to do a targeted elimination and reintroduction. If needed, have supervised oral food challenges. Avoid paying for IgG panels; they’re not supported by evidence and often cause harm by prompting unnecessary elimination. If you want specific providers/products to use: Allergy testing: board‑certified allergist; specific IgE testing via ImmunoCAP (Thermo Fisher) run on major labs (Quest, LabCorp). Celiac testing: tTG‑IgA (Quest Diagnostics, LabCorp). Breath testing (lactose/fructose/SIBO): performed at GI clinics using standard clinical breath analyzers (ask your GI clinic which equipment/protocol they use). Diet guidance and elimination challenges: registered dietitians specializing in food allergies/IBS (many practices and hospital nutrition departments offer this). If you tell me your main symptoms (immediate hives/anaphylaxis vs bloating/diarrhea vs chronic fatigue/eczema), I can recommend the exact test and next step for your situation.

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Short answer: there isn’t a single, validated “food sensitivity” blood test that reliably identifies non‑allergic food intolerances. The tests that are evidence‑based depend on the suspected problem (true allergy, celiac disease, lactose/fructose intolerance, SIBO/IBS). Avoid commercial IgG panels and similar direct‑to‑consumer “food sensitivity” tests — they’re not supported by good evidence and often lead to unnecessary restriction. Recommended, evidence‑based options (and brands/labs) 1) If you have immediate allergic reactions (hives, swelling, anaphylaxis) What to get: skin‑prick testing by an allergist and/or serum specific IgE testing. Trusted brand/lab: ImmunoCAP (Thermo Fisher) is the standard assay many allergists and clinical labs (Quest Diagnostics, LabCorp, ARUP) use. Why: Validated for IgE‑mediated allergy and interpreted by a clinician. 2) If you suspect celiac disease or gluten‑related disease What to get: tissue transglutaminase IgA (tTG‑IgA) plus total IgA; possibly deamidated gliadin peptide (DGP) IgG if IgA deficient. Where: standard labs (Quest, LabCorp, ARUP). Why: These serologies are the accepted diagnostic tests for celiac disease. Important: do NOT start a gluten‑free diet before testing. 3) If you suspect carbohydrate malabsorption (lactose, fructose) or SIBO What to get: hydrogen/methane breath tests (lactose breath test, fructose breath test, or glucose/lactulose breath test for SIBO). Where: GI clinics or labs that run breath testing (many hospitals and gastroenterology centers; QuinTron makes common testing equipment). Why: Breath testing (with correct prep and interpretation) is the clinically used method for these problems. 4) If you have IBS or non‑IgE food triggers What to do: a structured elimination and reintroduction trial (for example low‑FODMAP), ideally guided by a registered dietitian experienced in GI disorders. Why: Many “sensitivities” are triggered by FODMAPs or other food groups; controlled elimination/rechallenge is the best diagnostic method. Tests and services to avoid (or use with caution) IgG food antibody panels sold direct‑to‑consumer (Everlywell, YorkTest, Vibrant Wellness, many clinic panels): Evidence shows IgG antibodies often reflect exposure, not harmful sensitivity. These tests can be misleading. ALCAT / MRT / some leukocyte‑activation tests and many multiplex “food reactivity” arrays (Cyrex arrays fall into more experimental category): poor or limited evidence for clinical usefulness; can generate unnecessary dietary restrictions. Broad “microbiome” testing or unvalidated biomarker panels claiming to identify food sensitivities — useful for research, not for diagnosing sensitivities. Practical next steps If you get acute/possibly dangerous reactions (difficulty breathing, lip/tongue/throat swelling): see an allergist or emergency care immediately. For ongoing GI or suspected sensitivity symptoms: start with a clinician visit (allergist or gastroenterologist) and/or an RD. Ask for evidence‑based tests above (ImmunoCAP/skin prick for allergy; tTG for celiac; breath tests for carbohydrate malabsorption). If you already have results from a commercial IgG panel, bring them to a clinician — but expect they will recommend confirmation via elimination trials or validated testing rather than acting on IgG results alone. If you want, tell me the symptoms you’re getting (timing, type of reaction, consistency) and I’ll suggest the most appropriate next test or the specialist to see.

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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: there isn’t a single reliable “food sensitivity” consumer kit that proves non–IgE food reactions. Tests that reliably diagnose immune-mediated or physiologic problems are done through doctors (and some specific lab assays). Avoid commercial IgG “food sensitivity” kits — they’re considered misleading by allergy experts. What works (and specific names/services) For suspected immediate (allergic) reactions: see a board‑certified allergist. They will do skin‑prick testing and/or serum specific IgE testing (ImmunoCAP / Phadia is the widely used, validated sIgE assay available through major labs such as Quest Diagnostics or LabCorp). If needed, the allergist can perform a supervised oral food challenge — the clinical gold standard. For suspected celiac disease: get standard celiac serology — tissue transglutaminase IgA (tTG‑IgA) plus total IgA, and possibly deamidated gliadin peptide (DGP) IgG — available through Quest Diagnostics or LabCorp and interpreted by your clinician. For lactose/fructose or bacterial overgrowth causes of GI symptoms: hydrogen breath testing done by gastroenterology clinics (many hospitals and GI labs offer these). For non‑allergic food intolerance or symptom management: a medically supervised elimination/ re‑challenge diet guided by a registered dietitian (find an RDN through the Academy of Nutrition and Dietetics at EatRight.org, or book a clinician via Zocdoc / local telehealth RDN services). What to avoid IgG-based “food sensitivity” panels sold direct-to-consumer (examples: Everlywell food sensitivity IgG test, Vibrant Wellness food panels, YorkTest, ALCAT) — major organizations (AAAAI, British guidelines, NHS, American Academy of Pediatrics) warn these tests don’t diagnose food allergy or clinically meaningful sensitivity, often give false positives, and can lead to unnecessary restrictive diets. Practical next step If you have hives, throat/airway symptoms, swelling, or immediate reactions: book an allergist (use the AAAAI “Find an Allergist” tool). If you have chronic GI symptoms (bloating, diarrhea, pain): ask your PCP for celiac testing and a referral for hydrogen breath testing or a gastroenterologist, and work with an RDN for an elimination diet. If you want, tell me the symptoms you’re having and I’ll suggest which of the above paths/tests is most appropriate.

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There is no reliable at-home “food sensitivity” test that can legitimately tell you which foods are causing chronic symptoms; the most evidence-based approach is to identify the specific problem first and use validated testing for food allergy or celiac disease, or a supervised elimination-and-rechallenge for suspected intolerance/sensitivity.[2][6][7][10] If you want the least scam-like answer, it is not an IgG food sensitivity panel such as Everlywell or similar direct-to-consumer tests, because major allergy organizations say IgG food tests have not been scientifically proven to diagnose food sensitivity and can produce misleading results.[1][6][10] Reviews that rank Everlywell “best overall” are evaluating convenience and packaging, not scientific validity.[1][4] What to do instead: If you get immediate symptoms like hives, swelling, wheeze, or vomiting, ask a clinician/allergist about a food allergy test such as skin-prick testing or specific IgE blood testing.[3][10] If you suspect celiac disease, get proper celiac testing through a clinician before removing gluten.[2] If symptoms are delayed and nonspecific, use a food and symptom journal plus a structured elimination diet and reintroduction with medical or dietitian guidance.[2][7][10] If you still want a consumer product anyway, I would not call any of them scientifically solid; the best-known brands like Everlywell, YorkTest, and similar IgG panels are the ones most often criticized by allergy societies.[1][6][10]

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