Diagnostic outcomes after gluten challenge in adult patients with unconfirmed coeliac disease already on a gluten-free diet: A 20-year retrospective cohort study.

Background: In uncertain cases of coeliac disease (CD), gluten challenge (GC) may be necessary to confirm or exclude the diagnosis. However, data on diagnostic outcomes after GC are limited.

Aims: We aimed to evaluate outcomes after GC in patients with unconfirmed CD who had already started a gluten-free diet (GFD), and identify predictors of a confirmed diagnosis.