Myths vs facts: IgE Allergietest and Darmgesundheit

The IgE allergy test measures specific antibodies against allergens and is validated for diagnosing immediate-type (Type I) allergies such as hay fever or food allergies. A common myth is that this test can also assess gut health or food intolerances (e.g., lactose intolerance, irritable bowel syndrome). In reality, IgE levels are not linked to gut barrier function or the microbiome. For genuine gut health assessment, stool analyses, IgG tests (controversial), or breath tests are more relevant, though evidence for many of these is weak. Many commercial providers market IgE tests as a 'gut health check,' which is not scientifically supported. The evidence for IgE testing beyond classical allergies is limited. Caveat: A positive IgE result does not automatically indicate clinical allergy – the gold standard remains provocation testing. For gut issues, consult a gastroenterologist rather than relying on IgE values.