wie testet man glutenunverträglichkeit — what can you do yourself?

There is no reliable self-test for gluten intolerance that you can do at home. Medical diagnosis distinguishes between celiac disease (an autoimmune condition) and non-celiac gluten sensitivity (NCGS). For celiac disease, the gold standard is a blood test for tissue transglutaminase antibodies (tTG-IgA) followed by a duodenal biopsy. For NCGS, diagnosis is usually made by exclusion: a gluten-free diet under medical supervision for several weeks, followed by a controlled gluten challenge. Self-administered elimination diets or DNA tests (e.g., for HLA-DQ2/DQ8) are not sufficiently validated to confirm or rule out gluten intolerance. Important: Do not start a gluten-free diet before diagnosis, as it can skew test results. If you experience persistent symptoms like bloating, diarrhea, or fatigue after gluten consumption, consult a gastroenterologist. The evidence for self-testing is weak; many commercial products overstate their reliability.