Thermo Fisher

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.

Mentioned in position 1 of 7

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.

Mentioned in position 4 of 10

Short answer: there’s no single, reliable “food sensitivity” test that covers all suspected reactions. Many direct-to-consumer IgG food panels are not evidence‑based and can be misleading. Use targeted, validated tests instead depending on the problem you have — or a supervised elimination/challenge. Which tests are actually useful (and why) For true (immediate, potentially dangerous) food allergy: skin prick testing by an allergist or a serum specific IgE test run with ImmunoCAP (Thermo Fisher) — typically ordered through reputable labs such as Quest Diagnostics, LabCorp or Mayo Clinic Laboratories. These tests detect IgE‑mediated allergy and are clinically validated. For celiac disease: tissue transglutaminase IgA (tTG‑IgA) with total IgA, available from Quest, LabCorp, Mayo Clinic Labs, etc. This is the standard screening test. For lactose intolerance: hydrogen (or hydrogen/methane) breath test — commonly done with QuinTron equipment at GI clinics or testing centers. This detects malabsorption rather than immune reaction. For SIBO or carbohydrate malabsorption: breath tests (hydrogen/methane) performed by GI clinics or specialized labs. For non‑IgE, delayed reactions or vague chronic symptoms: the gold standard is a supervised elimination diet with re‑challenge or a double‑blind placebo‑controlled food‑challenge (DBPCFC) done by a specialist. Work with a registered dietitian and/or allergist for this. What to avoid IgG or IgG4 “food sensitivity” panels sold direct‑to‑consumer (examples include Everlywell Food Sensitivity tests, Vibrant Wellness IgG panels, YorkTest) are considered unreliable by major allergy societies (AAAAI, EAACI). IgG often reflects exposure, not harmful sensitivity, and results commonly lead to unnecessary dietary restriction. Practical next step If you have hives, swelling, breathing problems or other immediate reactions: see a board‑certified allergist for skin testing or ImmunoCAP sIgE testing. If you have chronic GI symptoms (bloating, diarrhea): see a gastroenterologist for appropriate testing (tTG for celiac, breath test for lactose/SIBO). If symptoms are vague and you suspect multiple foods: work with an experienced dietitian and an allergist for a supervised elimination and re‑challenge; consider a DBPCFC if needed. If you tell me the symptoms you’re having (immediate hives vs chronic bloating vs etc.), I can recommend the single most appropriate test or specialist to see.

Mentioned in position 2 of 8

Short answer: there isn’t a single reliable “food sensitivity” home kit. The most trustworthy approach is a clinical evaluation by a provider with validated tests tailored to the problem — specifically skin-prick testing and/or serum specific‑IgE testing (for true allergic reactions), celiac serology for suspected celiac disease, hydrogen breath testing for lactose/SIBO, or an elimination diet supervised by a dietitian for suspected non‑IgE intolerances. Why: many direct‑to‑consumer “food sensitivity” panels that measure IgG antibodies (the common “IgG food sensitivity” tests) are not validated to diagnose food reactions. Professional allergy organizations say IgG often reflects exposure/tolerance and not pathological sensitivity, so those tests can lead to unnecessary restrictions. Recommended, evidence‑based options (by name and why): Skin‑prick testing performed by a board‑certified allergist Why: fast, inexpensive, clinically validated for IgE‑mediated allergy and interpreted in context of your history. Best first step for hives, anaphylaxis, immediate reactions. Serum specific‑IgE testing using ImmunoCAP (Thermo Fisher) through major labs such as Quest Diagnostics, LabCorp, or Mayo Clinic Laboratories Why: ImmunoCAP is a standardized, widely used lab method for specific IgE; useful when skin testing isn’t possible or to quantify sensitization. Must be interpreted by a clinician. Supervised oral food challenge (clinic/hospital) Why: the gold standard to confirm or rule out food allergy when tests and history are unclear. Celiac testing: tissue transglutaminase IgA (tTG‑IgA) plus total IgA — available at Quest/LabCorp/Mayo Why: validated test for celiac disease; important to do before removing gluten from diet. Lactose intolerance: hydrogen breath test performed by GI labs Why: validated for lactose malabsorption. Non‑IgE GI symptoms / suspected FODMAP sensitivity: structured low‑FODMAP elimination and reintroduction guided by a registered dietitian Why: no blood test reliably diagnoses FODMAP intolerance; supervised diet and reintroduction are the accepted method. Tests/companies to avoid for “food sensitivities”: IgG food panels marketed direct to consumers (examples: Everlywell Food Sensitivity IgG panels, Vibrant Wellness IgG panels, YorkTest IgG panels, and similar). These are widely criticized by allergists for poor clinical utility. What to do next: Write down your symptoms, timing relative to food, and any severe reactions. If you have immediate-type reactions (hives, swelling, throat tightness, breathing trouble), see an allergist urgently. For chronic GI symptoms, start with your primary care provider or a gastroenterologist (they can order celiac serology, breath tests) and/or a registered dietitian for a low‑FODMAP trial. If allergy is suspected, ask for skin‑prick testing or ImmunoCAP specific‑IgE testing and, if needed, a supervised oral food challenge. If you want, tell me your symptoms and whether reactions are immediate or delayed, and I can suggest the most appropriate next test and how to find a local allergist or GI clinic.

Mentioned in position 2 of 7

Short answer: there isn’t a single reliable “food sensitivity” blood test that proves food intolerances the way a true medical test should. The best approach is targeted, validated testing for specific problems (IgE allergy, celiac disease, carbohydrate malabsorption/SIBO) combined with clinical evaluation and — when needed — supervised oral food challenges or a professionally-guided elimination diet. Recommended, evidence-based tests and providers IgE-mediated food allergy (true, potentially life‑threatening allergy) Tests: skin prick testing by a board‑certified allergist and/or serum specific IgE testing using ImmunoCAP (Thermo Fisher). Why: Skin testing + ImmunoCAP are the validated standards used by allergists worldwide and guide diagnosis and management. Where: allergy clinics; hospital allergy departments; commercial labs (ImmunoCAP is run through major labs like Quest Diagnostics and LabCorp). Celiac disease Test: tissue transglutaminase IgA (tTG‑IgA) ± total IgA, and deamidated gliadin peptide (DGP) when indicated. Why: These serologies are validated for diagnosing celiac disease when you are still eating gluten. Where: widely available at LabCorp, Quest Diagnostics, hospital labs. Carbohydrate malabsorption (lactose, fructose) and SIBO Test: hydrogen (and methane) breath tests. Why: Breath testing is the accepted noninvasive test for lactose/fructose malabsorption and for SIBO when done properly. Where: many gastroenterology clinics and specialty labs — e.g., Genova Diagnostics offers breath testing; clinics use devices such as QuinTron BreathTracker. Gold standard for ambiguous cases: supervised oral food challenge Why: a monitored challenge done by an allergist is the most definitive way to prove or disprove a clinically significant reaction. Tests and companies to avoid for “food sensitivity” claims IgG food panels sold direct-to-consumer (examples: Everlywell IgG tests, Vibrant Wellness, YorkTest IgG): IgG antibodies generally reflect exposure, not pathological sensitivity, and major allergy and immunology societies advise against using IgG results to eliminate foods. MRT (Mediator Release Test) from Oxford Biomedical and broad “food reaction” panels marketed by many integrative labs: these lack consistent independent validation and can lead to unnecessary, restrictive diets. Microbiome tests (e.g., Viome) that claim to diagnose food sensitivities: interesting for research but not a validated tool for diagnosing intolerances. Practical next steps I recommend See a board‑certified allergist if your reactions are immediate (hives, swelling, throat tightness, breathing problems) — get skin testing and/or ImmunoCAP. If symptoms are gastrointestinal (bloating, diarrhea, gas), ask a gastroenterologist about breath testing for lactose/fructose and SIBO, and consider celiac serology (tTG‑IgA). Work with a registered dietitian experienced in food reactions to do a structured elimination and reintroduction (or a supervised oral food challenge when indicated). Avoid paying for broad IgG panels or similarly marketed “sensitivity” tests; they’re of limited clinical value and can cause harm from unnecessary food restriction. If you tell me your main symptoms (immediate hives/anaphylaxis vs delayed GI symptoms vs chronic eczema/headaches), I can suggest the single best next test and how to find a reputable local provider.

Mentioned in position 1 of 10

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.

Mentioned in position 1 of 8