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 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

1. See a board‑certified allergist if your reactions are immediate (hives, swelling, throat tightness, breathing problems) — get skin testing and/or ImmunoCAP.
2. If symptoms are gastrointestinal (bloating, diarrhea, gas), ask a gastroenterologist about breath testing for lactose/fructose and SIBO, and consider celiac serology (tTG‑IgA).
3. Work with a registered dietitian experienced in food reactions to do a structured elimination and reintroduction (or a supervised oral food challenge when indicated).
4. 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.