What do studies say about Gluten Check?

Regarding a 'Gluten Check' test, the provided context does not contain any direct studies. The closest entry (deep-qa-batch-1128) notes that DNA tests for gluten intolerance are not covered, and that genetic-diet interactions (e.g., APOE-omega-3) often have limited evidence due to study heterogeneity. For celiac disease, HLA-DQ2/DQ8 genotyping is clinically valid, but this is not a typical DTC 'gluten check.' For non-celiac gluten sensitivity, no validated genetic markers exist. The broader nutrigenetics literature (e.g., PMID:26861367 is irrelevant) shows that most DTC diet claims lack robust support. Therefore, evidence for a consumer 'Gluten Check' is unclear/weak. Consumers should consult a gastroenterologist for proper diagnosis and not self-prescribe a gluten-free diet based on unvalidated tests, as this can mask underlying conditions and lead to nutritional deficiencies.