Food Intolerance Test UK 2026: Are They Worth It? Prices & Accuracy

How much does a food intolerance test cost in the UK? Home test kits based on IgG antibodies cost £39 to £299 depending on the provider and number of foods tested. However, before you buy one, you need to know that the NHS, NICE, and major allergy organisations do not recommend IgG food intolerance tests as a reliable way to identify food intolerances.

This guide explains what these tests claim, what the evidence actually says, and what to do instead.

The critical distinction: IgG intolerance tests vs IgE allergy tests

This is the most important thing to understand before spending money on testing:

| | IgG food intolerance tests | IgE allergy tests | |---|---|---| | What they measure | IgG antibodies to foods | IgE antibodies to allergens | | Clinical validation | Not recommended by NHS/NICE | Clinically validated, used in NHS | | What results mean | IgG indicates exposure to food, not intolerance | IgE indicates immune sensitisation to an allergen | | Recommended by | Private testing companies | Allergists, immunologists, NICE, BSACI | | Cost | £39–£299 (home kit) | £50–£350 (private); free via NHS referral |

What the NHS and NICE say

The NHS is clear on this topic: IgG food intolerance tests are not recommended. The reasons are:

• IgG antibodies are produced as a normal response to food proteins — their presence does not indicate intolerance
• Studies have shown IgG levels to food correlate with recent consumption, not adverse reactions
• Restricting foods based on IgG results can lead to unnecessary dietary restriction and nutritional deficiencies
• NICE guidelines do not include IgG testing in the diagnostic pathway for food intolerance

The British Dietetic Association has also stated that IgG food intolerance tests "lack scientific evidence" and should not be used to guide dietary changes.

Food intolerance test providers and prices

Despite the lack of clinical endorsement, these tests are widely marketed in the UK:

| Provider | Test | Price | Foods tested | |----------|------|-------|-------------| | YorkTest | Premium Food Intolerance Test | From £49 | Up to 200 foods | | Lifelab Testing | Food Intolerance Complete | From £69 | Up to 160 foods | | Medichecks | Food Sensitivity Test | From £39 | 40+ foods | | Everlywell (US-based) | Food Sensitivity Test | From £149 | 96 foods | | Check My Body Health | Complete Intolerance Test | From £79 | Up to 970 items |

These tests all use IgG or IgG4 antibody measurement. While the testing process itself (blood collection, laboratory analysis) is technically sound, the clinical interpretation of results is where the problem lies.

So are food intolerance tests worth it?

For most people, no. Here is what you are actually getting:

• A list of foods your immune system has encountered (which you likely already know because you eat them)
• No reliable indication of which foods, if any, are causing your symptoms
• A risk of unnecessarily cutting out nutritious foods

Some people report feeling better after following the exclusion diet suggested by their test results. This may be because:

• Eliminating multiple foods often leads to eating less processed food overall
• The placebo effect is well-documented in dietary interventions
• By chance, the test may flag a food you genuinely react to — but the same result could be achieved with a structured elimination diet

When testing IS useful

There are legitimate, evidence-based tests for food-related conditions:

IgE allergy testing (clinically validated)

If you experience immediate reactions to food (hives, swelling, breathing difficulty, anaphylaxis), your GP can refer you for:

• Skin prick testing — performed at an allergy clinic, results in 15 to 20 minutes
• Specific IgE blood tests — measures IgE antibodies to specific allergens
• Oral food challenge — supervised by a specialist, the gold standard for diagnosis

These are available free on the NHS via GP referral, or privately from £50 to £350.

Coeliac disease screening

If you suspect a reaction to gluten or wheat, ask your GP for a tTG-IgA blood test — the standard screening test for coeliac disease. This is a validated, evidence-based test available free on the NHS. You must be eating gluten regularly for at least 6 weeks before the test for accurate results.

Lactose intolerance

A hydrogen breath test is the standard diagnostic tool, available via NHS gastroenterology referral. A simpler approach is a supervised lactose elimination and reintroduction with your GP or dietitian.

What to do instead of buying a food intolerance test

If you have ongoing symptoms like bloating, abdominal pain, headaches, or fatigue that you suspect are food-related:

1. See your GP — rule out coeliac disease, IgE-mediated allergy, and other conditions first
2. Ask for a dietitian referral — NHS dietitians can supervise an evidence-based elimination diet
3. Try an elimination diet — remove suspected foods for 2 to 4 weeks, then reintroduce one at a time while tracking symptoms
4. Keep a food and symptom diary — this is free and often more informative than any test
5. Consider private IgE allergy testing if NHS wait times are long and you want faster answers about true allergic reactions

Compare allergy testing prices

If you do need validated allergy testing (IgE-based), you can compare private options:

Related guides

• Allergy Test Cost UK — skin prick, blood test, and home kit prices
• Private Blood Tests UK — how at-home blood testing works
• Best Home Blood Test Kits UK — provider comparison for validated tests