How can I find a blood test that detects food intolerances?

A blood test that truly detects food intolerances you can recognize by one clear feature: It measures IgG antibodies from a genuine blood sample—not IgE antibodies, which are responsible for classic allergies, let alone methods without blood sampling such as bioresonance or hair analyses, for which there is no scientific evidence base. At mybody®, this task is performed by the NutriCheck IgG blood test, which specifically analyzes IgG antibodies against up to 300 foods.

Are you unsure whether your symptoms are more likely to indicate an intolerance or suggest a classic allergy, there is also the KombiCheck, combines IgG and IgE antibodies in one test. Further down, we explain we will show you in three steps how to find the right test, what what the difference between IgG and IgE is and which symptoms typically suggest an intolerance to a food.

Find the right test in 3 steps

IgG vs. IgE: The key distinguishing feature

The most important indication of whether a blood test really detects intolerances reveals: It must measure IgG antibodies. An food intolerance is often based on delayed immunological reactions in which your body produces specific forms IgG antibodies against certain foods. The symptoms— such as digestive problems, skin reactions, or fatigue—often occur when only appear hours or even days after eating, making them difficult to associate. makes everyday life so difficult.

A classic food allergy works differently: Here, your immune system reacts immediately via IgE antibodies, activate mast cells and release histamine. A test that only measuring IgE therefore does not help if you suspect an intolerance no further—it is intended for classic allergy symptoms such as sneezing, itchy eyes or skin rash immediately after contact. That is precisely why the question “Does the test measure IgG or IgE?” is the the fastest way to find a blood test suitable for intolerances to distinguish it from an allergy test.

NutriCheck vs. KombiCheck compared

suspect only an intolerance and no classic allergy, NutriCheck is the more targeted and affordable test. If you if you are unsure whether an allergy also plays a role, the KombiCheck a second test, as it analyzes both antibody types simultaneously covers. If, on the other hand, you suffer exclusively from classic allergy symptoms without any indication of an intolerance, you can find the suitable IgE-only test (AllergieCheck) as well as the complete comparison of all 3 mybody® blood tests in our detailed guide to reliable intolerance and allergy tests.

NutriCheck | Intolerance Test (IgG)

The specialized test that specifically detects food intolerances.

Measures IgG antibodies against up to 300 foods using a capillary blood sample, analyzed in an ISO-certified laboratory. Analysis reports are divided into 13 categories, with results available in the online portal. Price: €169 (instead of €199).

Conclusion: The most direct answer to the question “Which test detects my food intolerance?”

View NutriCheck

KombiCheck | Intolerance & Allergy Test

If you are unsure whether an intolerance or an allergy is causing your symptoms.

Combines IgG and IgE antibody analysis in one test kit and analyzes around 600 foods and allergens. Price: €269 (instead of €299). Bestseller in this category.

Conclusion: Detects both delayed intolerances and classic allergy symptoms in a single test.

View KombiCheck

Typical symptoms that an IgG test can detect

Before deciding on a test, it helps to know which symptoms indicate a food intolerance at all. Typical symptoms include gastrointestinal problems such as bloating, diarrhea, nausea, or abdominal pain, along with skin rashes and a general feeling of discomfort or Fatigue that is difficult to associate with a specific food in terms of timing are.

Important for distinguishing them: respiratory symptoms such as a runny nose, cough, or wheezing, as well as tingling, redness, and swelling in the mouth and throat area can occur with both intolerances and allergies occur—even in severe cases, progressing to anaphylactic shock, a life-threatening reaction requiring immediate medical attention. requires. Especially in cases of overlap, the IgG+IgE test (KombiCheck) is often the safer choice to rule out or confirm both causes at the same time. to rule out or confirm.

Most common triggers of food intolerances

In principle, more than 170 foods can cause intolerances or cause allergic reactions. However, the most common are cow’s milk and eggs, legumes—especially peanuts and soy— tree nuts such as nuts, wheat, as well as fish and shellfish are the focus. That is precisely why NutriCheck tests for up to 300 different several foods at the same time instead of isolating only individual suspects consider.

Some of these intolerances, such as those to cow's milk, eggs, wheat, or soy disappear in some people over the course of their lives again, while reactions to nuts, fish, and shellfish are usually remain permanently. A blood test always shows only your current status, so your current status—so it may make sense to repeat the test if persistent or newly occurring symptoms after a few years repeat it.

What happens after the test?

After the laboratory analysis, you will receive a structured digital digital report showing you which foods have elevated IgG levels have been measured. Based on this, you can specifically start a so-called elimination diet: gradually reduce or replace the foods identified as problematic and observe whether your symptoms improve noticeably as a result.

Important: An IgG test result is a guide, not definitive proof of an intolerance. Elevated IgG levels may may simply indicate that you have eaten a food frequently recently eaten. For major dietary changes—especially if you want to eliminate several food groups at the same time— it is therefore advisable to discuss this with a doctor or consulting a nutritionist so that your diet remains balanced despite the restrictions. remains balanced.

Who is this test particularly useful for?

An IgG test is particularly worthwhile if you regularly suffer from digestive problems, skin reactions, or nonspecific symptoms after you suffer from digestive problems, skin reactions, or nonspecific symptoms after eating without a clear trigger being identified is also the case with unexplained weight gain, chronic fatigue, or long-lasting symptoms for which no other cause has yet been has been found, the test can provide important indications.

A pure IgG test is less suitable, however, if your symptoms immediately and intensely after contact with a particular food occur immediately and intensely after contact with a particular food—this points more strongly to a classic allergy, for which an IgE component is important to you in the test. In this case, the KombiCheck is the safer choice, as it detects both antibody types at the same time and is providing a more complete picture of your reactions.

How does blood collection at home work?

Both tests work using a simple drop of capillary blood that you you collect yourself from your fingertip using a lancet. The test kit includes an illustrated guide and everything you need for a hygienic collection—you do not need to visit a doctor, as the the entire procedure takes only a few minutes.

Then send the sample in the prepaid return envelope to the partner laboratory. This is where the specific antibodies against tested foods or allergens, before you structured digital results report for the tested foods or allergens before you view in the online portal—clearly organized by category and with with specific values instead of vague traffic-light symbols.

Frequently asked questions

Last updated and reviewed for content on July 13, 2026, by the mybody® team.