Food Sensitivity Test Comparison 2026: MRT vs IgG vs Skin Prick — Which Test Do You Actually Need?

Kerry Watson, NTP, RWP

In-House Expert Nutrition Consultant · Updated June 26, 2026

You suspect food is making you sick. You’ve Googled “food sensitivity test” and now you’re staring at a dozen options — skin prick tests, IgG panels, ALCAT, MRT, at-home kits. They all claim to find your food triggers. So which one actually works? This guide cuts through the marketing and explains what each test actually measures, so you can make an informed decision.

The 3 Types of Food Reactions (Most People Confuse These)

Before comparing tests, you need to understand what you’re testing for:

Why this matters: A skin prick test only detects IgE allergies. If your symptoms are delayed (bloating 6 hours after eating, migraine the next morning), a negative allergy test doesn’t mean food isn’t the problem — it means you need a different test.

Head-to-Head: Every Major Food Sensitivity Test Compared

For a deeper clinical analysis including reproducibility data, see our detailed reference: MRT vs IgG vs ALCAT: Clinical Comparison →

Which Test Should You Choose? A Decision Guide

Use this flowchart based on your symptoms and goals:

The IgG Problem: Why Cheaper Isn’t Better

The most common objection we hear: “Why would I spend $300+ on MRT when I can get an IgG panel for $99?”

Here’s the clinical issue: IgG antibodies are a normal part of food digestion. Your body produces IgG antibodies to virtually every food you eat regularly. A high IgG score for chicken doesn’t mean chicken is making you sick — it means you eat chicken regularly.

Major medical organizations have taken clear positions on this:

• The American Academy of Allergy, Asthma & Immunology (AAAAI) states that IgG tests for food sensitivity have not been validated and should not be used to guide dietary decisions
• The European Academy of Allergy and Clinical Immunology (EAACI) has issued similar guidance against IgG-based food sensitivity testing
• The Canadian Society of Allergy and Clinical Immunology explicitly recommends against IgG food sensitivity panels

The MRT bypasses this problem entirely by measuring the end result — whether your immune cells actually release inflammatory mediators when exposed to a substance, regardless of which immune pathway is involved.

What About the Skin Prick Test?

Skin prick tests are the gold standard for diagnosing IgE food allergies (immediate reactions). They’re usually covered by insurance and performed by board-certified allergists.

However, skin prick tests cannot detect delayed food sensitivities. If your symptoms appear hours to days after eating — which is how food sensitivities typically present — a negative skin prick result doesn’t rule out food as the cause.

Many patients arrive at MRT testing after receiving normal skin prick results but continuing to experience chronic symptoms. The two tests are complementary, not competing.

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