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

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

1. If you have immediate-type reactions (hives, throat tightness, wheeze, anaphylaxis) see an allergist urgently.
2. 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.
3. 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.