Evidence check: HLA-DQ2 in the context of Darmgesundheit

HLA-DQ2 is a well-established genetic risk factor for celiac disease, an autoimmune enteropathy triggered by gluten. Over 90 % of celiac patients carry HLA-DQ2 (DQA1*05/DQB1*02), yet only about 2–5 % of carriers develop the disease, indicating that additional genetic and environmental factors are required. Therefore, a positive HLA-DQ2 test alone does not diagnose celiac disease; serology (tTG-IgA) and duodenal biopsy remain the gold standard. Consumer DNA tests that report HLA-DQ2 in the context of gut health should be interpreted cautiously: they indicate genetic susceptibility, not current disease. Some direct-to-consumer offerings may overstate the link to non-specific digestive issues or irritable bowel syndrome, for which evidence is limited. There is no proven benefit of a gluten-free diet for HLA-DQ2 carriers without celiac disease. In summary, HLA-DQ2 is a valuable screening marker, but its clinical utility depends on confirmatory testing. Anyone with persistent gut symptoms should consult a gastroenterologist rather than rely solely on genetic results.