Cyrex

Short answer: There is no single, clinically validated “food sensitivity” blood test that reliably diagnoses non‑allergic food intolerances. Tests that are well supported depend on what you suspect: If you suspect a true food allergy (fast, repeatable hives/angioedema/ breathing problems): see an allergist for skin‑prick testing and/or serum specific IgE testing (ImmunoCAP by Thermo Fisher is the most widely used and validated lab method). The allergist may do a medically supervised oral food challenge — the gold standard. If you suspect celiac disease: get lab testing for tissue transglutaminase IgA (tTG‑IgA) plus total IgA (and deamidated gliadin peptide IgG if IgA deficient). These are standard tests offered by major labs (Quest Diagnostics, LabCorp, hospital labs) and are evidence‑based. If you suspect lactose/fructose malabsorption or small intestinal bacterial overgrowth (SIBO): hydrogen (or hydrogen/methane) breath testing performed through a gastroenterologist or reputable GI lab is the appropriate test. (Many clinics use QuinTron analyzers; quality depends on proper prep and interpretation.) If you suspect non‑IgE, non‑celiac “food sensitivities” (for example, foods that seem to trigger IBS symptoms): there is no validated blood test. An elimination diet with structured reintroduction — ideally supervised by a registered dietitian — or a trial of a proven therapy (for IBS, a low‑FODMAP elimination guided by a dietitian; see Monash University FODMAP resources) is the evidence‑based approach. What to avoid IgG antibody panels marketed as “food sensitivity” tests (Everlywell, YorkTest, Cyrex, Alcat/MRT and similar) are not supported by consensus guidelines. IgG often reflects exposure to foods and tolerance, not harmful sensitivity, and using those results to restrict foods can lead to unnecessary diets and nutrient gaps. Major allergy/gastroenterology societies advise against using IgG testing to diagnose food intolerance. Practical next steps If you have immediate allergic symptoms (hives, swelling, breathing trouble), see an allergist right away. If you have chronic GI symptoms (bloating, diarrhea, gas, abdominal pain), start with your primary care or gastroenterologist to rule out celiac (tTG‑IgA), order appropriate breath tests for lactose/SIBO, and consider a supervised elimination (low‑FODMAP) with a dietitian. If you want testing for IgE‑mediated allergy but not a clinic with skin tests, ask for ImmunoCAP (specific IgE) from a reputable lab (Quest/LabCorp) and get interpretation from an allergist. If you tell me your symptoms (timing of reactions, GI vs skin/respiratory, how long this has been happening), I can recommend the most appropriate first test and whether you should see an allergist, GI, or a dietitian.

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Short answer: there is no single, reliable commercial "food sensitivity" blood test that proves you’re sensitive to foods. IgG food panels (the common “food sensitivity” tests sold direct-to-consumer) are not supported by good evidence and are actively discouraged by allergy specialists. The best route depends on what you mean by “sensitivity”: If you suspect an immune (allergic, potentially serious) reaction See a board‑certified allergist. They will do skin‑prick testing and/or validated blood testing for specific IgE antibodies (ImmunoCAP/Phadia is the most commonly used, clinically validated assay offered through major labs such as LabCorp or Quest). The gold standard for diagnosis of a true food allergy is a medically supervised oral food challenge in clinic. If you suspect celiac disease Get celiac serology (tissue transglutaminase IgA, often with total IgA) through a reputable lab (LabCorp, Quest). If positive, follow up with GI referral. If you suspect lactose/fructose intolerance or SIBO Breath testing (hydrogen/methane) done in a gastroenterology clinic is the appropriate test. Many clinics use QuinTron analyzers; ask your GI clinic which system they use and that they follow standard preparation/interpretation protocols. If you have chronic GI symptoms without clear allergy An elimination diet or structured low‑FODMAP trial supervised by a registered dietitian (RDN) who specializes in GI issues is the most evidence‑based approach. Monash University provides the research-backed low‑FODMAP program and app used by many clinicians. Tests to avoid as definitive proof IgG "food sensitivity" panels sold directly to consumers (examples you might see: Everlywell, Vibrant, YorkTest, Cyrex, etc.) are not reliable indicators of food intolerance and can lead to unnecessary, restrictive diets. Major allergy societies advise against using IgG testing to diagnose food sensitivities. Practical next steps If you have immediate-type reactions (hives, throat tightness, wheeze, anaphylaxis) see an allergist urgently. If symptoms are mainly GI (bloating, pain, diarrhea) start with: (a) celiac testing if not already done, (b) hydrogen breath testing if lactose/fructose/SIBO is suspected, and (c) a supervised elimination/low‑FODMAP protocol with an RDN. Use established clinical labs (LabCorp, Quest) and board‑certified specialists; avoid consumer IgG panels marketed as definitive. If you want, tell me your main symptoms and whether you get immediate allergic-type reactions; I can suggest the single most appropriate next test or the right specialist to see.

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Short answer: There isn’t a single, reliable “food sensitivity” blood test that proves foods are causing vague symptoms. Many commercial IgG “food sensitivity” panels (Everlywell, YorkTest, Vibrant, some Cyrex panels) are not supported by major allergy/gastroenterology groups and can be misleading. The best approach is to pick the test that matches your symptoms and use validated methods or see the right specialist. What to use instead (by problem) Suspect immediate allergic reaction (hives, throat tightness, trouble breathing, anaphylaxis) Best test: Skin-prick testing performed by a board‑certified allergist (gold standard) or serum specific IgE testing (ImmunoCAP is a well-validated lab assay). Where: See an allergist; labs like Quest Diagnostics or LabCorp perform specific-IgE (ImmunoCAP) if ordered by your clinician. Suspect celiac disease (diarrhea, weight loss, iron deficiency, bloating) Best test: Tissue transglutaminase IgA (tTG‑IgA) plus total IgA (and sometimes deamidated gliadin peptide IgG). Where: Quest, LabCorp, or your doctor can order these; referrals to gastroenterology if positive. Suspect lactose/fructose intolerance or small intestinal bacterial overgrowth (SIBO) causing bloating, gas, diarrhea/constipation Best test: Breath testing (hydrogen and methane) using validated protocols. Many GI clinics use QuinTron-based testing and follow consensus guidelines. Where: GI clinic or specialty lab (ask your gastroenterologist which lab they use). Ongoing IBS-like symptoms without alarm features Best approach: Work with a gastroenterologist and a registered dietitian (RDN) experienced with the low‑FODMAP elimination/rechallenge protocol (this is the evidence-based way to identify carbohydrate triggers). Where: Look for RDNs certified in gastrointestinal nutrition or working in academic centers (Mayo Clinic, Cleveland Clinic, large university GI practices). What to avoid IgG food panels sold directly to consumers (Everlywell, Vibrant, YorkTest, many “food sensitivity” kits). Major organizations (American Academy of Allergy and Asthma, American College of Gastroenterology) say IgG antibodies usually indicate exposure/tolerance, not harmful sensitivity, and using them can lead to unnecessary, restrictive diets. Practical next steps If you’ve had a dangerous reaction (throat swelling, trouble breathing, fainting) go to emergency care and then see an allergist. If symptoms are mainly digestive, ask your primary care doctor about celiac serology and a referral to GI and an RDN for a guided elimination (low FODMAP). If you want one reliable lab pathway: see an allergist for skin-prick or ImmunoCAP specific‑IgE testing (Quest/LabCorp), or see GI for breath testing (QuinTron-based) and celiac serology. If you tell me your main symptoms (hives vs bloating vs delayed rash vs diarrhea), I can recommend the single most appropriate test and help find local labs/clinics.

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Short answer: there isn't a single validated commercial "food sensitivity" blood test for general symptoms — many direct‑to‑consumer IgG panels are not supported by evidence and should be avoided. The best approach is to get the specific, evidence‑based tests that match what you suspect (allergy, celiac disease, or an intolerance) and/or a supervised elimination/rechallenge. What to use instead (by situation) Suspected immediate allergy (hives, throat tightness, anaphylaxis, wheeze): see a board‑certified allergist for skin‑prick testing and/or serum specific IgE testing using ImmunoCAP (Thermo Fisher/Phadia). These tests are run by major labs (Quest Diagnostics, LabCorp) and are clinically validated. The allergist can also perform a supervised oral food challenge (the gold standard) if needed. Suspected celiac disease (diarrhea, weight loss, iron deficiency, family history): order tissue transglutaminase IgA (tTG‑IgA) plus total IgA (and possibly deamidated gliadin peptide tests) through reputable labs such as Quest or LabCorp. HLA‑DQ2/DQ8 typing can be useful in select cases. Suspected lactose, fructose intolerance or SIBO (bloating, gas after eating): get a medically supervised hydrogen (and/or methane) breath test — available via gastroenterology clinics and some labs. A gastroenterologist can interpret results and recommend treatment. Non‑allergic, non‑celiac symptoms (chronic GI upset, fatigue, vague symptoms): the best validated method is a structured elimination diet with a registered dietitian and, if needed, blinded food challenges (double‑blind placebo‑controlled food challenge is the research gold standard). This avoids false positives from unproven blood panels. What to avoid IgG food‑sensitivity panels sold direct to consumers (Everlywell, Vibrant Wellness, Cyrex, YorkTest, many others). Major allergy societies (AAAAI, BSACI and others) state IgG antibodies typically indicate exposure—not harmful sensitivity—and using those results to eliminate foods can be misleading and nutritionally harmful. Practical next steps Clarify your main symptoms (allergic reactions vs digestive symptoms vs general fatigue/aches). I can help with that if you describe them. If allergy‑type symptoms: book an appointment with an allergist for skin testing/ImmunoCAP and possible challenge. If GI symptoms: see a gastroenterologist for breath testing or celiac serology. If unclear: work with a registered dietitian for a supervised elimination/rechallenge plan. If you want, tell me what symptoms you have and whether you’ve already tried any tests — I can suggest the most appropriate next test or specialist and help you find a local provider or lab.

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