Food Intolerance Test

Food Intolerance (IgG-Mediated Hypersensitivity) Test
So-called “food intolerances” (IgG-mediated hypersensitivity reactions) are adverse reactions to certain food proteins. These reactions can be detected and quantified through the measurement of class G antibodies (IgG). Today, this type of immune reaction is often referred to as a “food intolerance,” even though true intolerances do not involve the immune system but rather metabolism (e.g., lactose intolerance).
IgG-mediated reactions are also distinct from IgE-mediated food allergies, which are responsible for allergic reactions occurring shortly after the consumption of the trigger food. The incidence of IgE-mediated food allergies in adults is relatively low (1–2%), whereas IgG-mediated adverse reactions are much more common, affecting up to 40% of the population.

Food protein intolerance is dose-dependent (proportional to the quantity of the food consumed). Symptoms are linked to the accumulation of substances that the body cannot tolerate and often appear with a delay after ingestion. Intolerance can be caused by:

• Specific molecules present in foods
• Malabsorption of major food components
• Alterations of the intestinal barrier leading to an abnormal immune response in this area
• Imbalance of gut microbiota
• A poorly varied or unbalanced diet

The Natrix “Food Intolerance Test” is an allergometric test that, through a blood sample, identifies adverse reactions to 184 food proteins. Specifically, it quantifies the direct reaction between class G antibodies (IgG) present in the patient’s serum and certain food antigens. This test is useful for identifying foods that may negatively affect the body.

As shown by numerous studies, eliminating these foods from the diet for 4–6 months and then gradually reintroducing them can lead to significant symptom improvement. Such an elimination diet should be carried out under the supervision of a qualified nutrition specialist.

The Natrix “Food Intolerance Test” uses a standardized and highly reproducible analytical method (ELISA). The complete results are provided in a table listing all tested foods along with their reactivity percentage.

Booking and Procedure
An appointment is required, but no specific preparation is necessary — simply avoid eliminating any suspected foods in the month before the exam.

The test is performed at the pharmacy, where a trained healthcare professional will collect the blood sample. The sample is then sent to the Natrix Lab for analysis. The report is generally available within two weeks and is sent by the pharmacy to the patient at the email address provided during the booking process.