Myths vs facts: HLA-DQ2 and gut health

HLA-DQ2 is a gene encoding an immune system protein strongly associated with celiac disease. Myth: A positive HLA-DQ2 test means you will inevitably develop gluten intolerance or gut inflammation. Fact: HLA-DQ2 is necessary but not sufficient for celiac disease; only about 3% of carriers develop the condition. Gut health is influenced by many factors: microbiome, diet, other genes. Direct-to-consumer tests often market HLA-DQ2 as a 'gut health marker,' but its clinical utility for asymptomatic individuals is unclear. A negative test largely rules out celiac disease (high negative predictive value), while a positive test alone does not justify a gluten-free diet. Evidence: The association with celiac disease is human-strong; for general gut health claims it is marketing-driven. Caveat: Genetic testing without medical indication is not recommended.