RT Journal Article T1 Prospective longitudinal study: use of faecal gluten immunogenic peptides to monitor children diagnosed with coeliac disease during transition to a gluten-free diet. A1 Comino, Isabel A1 Segura, Verónica A1 Ortigosa, Luis A1 Espín, Beatríz A1 Castillejo, Gemma A1 Garrote, José Antonio A1 Sierra, Carlos A1 Millán, Antonio A1 Ribes-Koninckx, Carmen A1 Román, Enriqueta A1 Rodríguez-Herrera, Alfonso A1 Díaz, Jacobo A1 Silvester, Jocelyn Anne A1 Cebolla, Ángel A1 Sousa, Carolina AB Treatment for coeliac disease is a lifelong strict gluten-free diet. Although guidelines recommend regular follow-up with dietary interviews and coeliac serology, these methods may be inaccurate. To evaluate the usefulness of faecal gluten immunogenic peptides to support the diagnosis and to determine the adherence to the gluten-free diet in coeliac children. Multicentre prospective observational study including 64 coeliac children. Faecal gluten peptides, and tissue transglutaminase and deamidated gliadin peptide antibodies were analyzed at diagnosis, and 6, 12 and 24 months thereafter. Gluten consumption was estimated from gluten peptide levels. Most children (97%) had detectable gluten peptides at diagnosis. On a gluten-free diet, the rate of gluten peptides increased from 13% at 6 months to 25% at 24 months. Mean estimated gluten exposure dropped from 5543 mg/d at diagnosis to 144 mg/d at 6 months, then increased to 606 mg/d by 24 months. In contrast, deamidated gliadin peptide antibodies normalised and only 20% had elevated tissue transglutaminase antibody by 24 months. The elevation of tissue transglutaminase antibody was more prolonged in patients with detectable gluten peptides (P  0.1). Dietitian assessment was only moderately correlated with gluten peptide detection (κ = 0.5). Faecal gluten peptides testing may guide treatment of coeliac disease prior to diagnosis and during the assessment diet adherence. Further studies could determine if early identification of gluten exposure reduces the need for expensive/invasive investigations for non-responsive coeliac disease. ClinicalTrials.gov Number: NCT02711397. YR 2019 FD 2019-05-10 LK http://hdl.handle.net/10668/13935 UL http://hdl.handle.net/10668/13935 LA en DS RISalud RD Apr 5, 2025