Is HLA-DQ2 useful for gut health?

HLA-DQ2 is a well-established genetic marker for celiac disease, an autoimmune condition affecting the gut. About 25–30 % of the population carry HLA-DQ2, but only a minority develop celiac disease. Testing for HLA-DQ2 is clinically useful to rule out celiac disease: if both HLA-DQ2 and HLA-DQ8 are absent, the likelihood of celiac disease is extremely low. However, a positive result alone does not diagnose celiac disease; it must be combined with serology (tTG-IgA) and biopsy. For general gut health (e.g., bloating, IBS, microbiome balance), HLA-DQ2 has limited utility because it does not predict non-celiac gluten sensitivity or other functional disorders. The evidence is human-strong for celiac risk association, but not for broader gut health claims. Caveat: Direct-to-consumer genetic tests may overstate the relevance; always consult a gastroenterologist for interpretation.