Is IgG useful for Darmgesundheit?

The usefulness of IgG testing for gut health is controversial. The provided context does not contain specific information on IgG. IgG (immunoglobulin G) is often measured in so-called 'food sensitivity tests', particularly IgG4 against foods. However, scientific evidence for the clinical utility of such tests is weak. Major allergy and immunology societies (e.g., EAACI, AAAAI) advise against IgG-based food tests because they do not reliably diagnose intolerances or gut diseases. For assessing gut health, established methods like stool tests for inflammatory markers (e.g., calprotectin), microbiome analysis, or clinical evaluation for IBS and leaky gut are more appropriate. IgG tests may serve as a complementary tool but should not be used alone for diagnosis. Caveat: No FDA or CE clearance for diagnosing gut conditions. Evidence: primarily marketing, lacking strong clinical data.