What is the best food sensitivity test that is not a scam?

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

1. If you’ve had a dangerous reaction (throat swelling, trouble breathing, fainting) go to emergency care and then see an allergist.
2. 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).
3. 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.