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Standardised approach to gluten challenge in diagnosing childhood coeliac disease
Insights
This study challenged children previously diagnosed with celiac disease (an autoimmune disorder triggered by gluten) with gluten reintroduction. Results confirmed celiac disease in 17 children, highlighting the importance of accurate diagnosis and gluten challenge protocols.
Area of Science:
- Pediatric Gastroenterology
- Immunology
- Nutrition
Background:
- Celiac disease diagnosis in children can be challenging.
- Previous diagnoses may be based on insufficient evidence.
- Long-term gluten-free diets can mask underlying conditions.
Purpose of the Study:
- To evaluate the diagnostic accuracy of gluten challenge in children with prior celiac disease diagnoses.
- To assess the impact of gluten reintroduction on jejunal mucosal biopsies.
- To determine the relapse rate of celiac disease after gluten challenge.
Main Methods:
- Thirty-five children with prior celiac disease diagnoses underwent a standardized gluten challenge protocol.
- Procedures included hospital admission, blood xylose tests, and jejunal biopsies.
- Gluten was administered at 20 g/day, with follow-up assessments every two weeks.
Main Results:
- Seventeen children (48.6%) showed abnormal post-challenge biopsies indicative of celiac disease relapse.
- Fourteen of these children completed the challenge within eight weeks.
- Seventeen children had normal biopsies after three months and were returned to a normal diet.
Conclusions:
- Gluten challenge is a valuable tool for confirming or refuting celiac disease in children with uncertain prior diagnoses.
- Accurate histological assessment post-gluten challenge is crucial for diagnosis.
- The duration of gluten challenge did not correlate with age, prior diet duration, biopsy findings, or HLA status in confirmed cases.
Abstract:
Thirty-five children, in whom coeliac disease had been diagnosed on inadequate grounds and who had been on a gluten-free diet for one to 10 years, were challenged with gluten in accordance with a standardised procedure. All children were admitted to hospital for 48 hours for general assessment, two one-hour blood xylose tests, and the introduction of gluten. Thirty children underwent a pre-challenge peroral jejunal mucosal biopsy; the specimens were either normal or showed slight non-specific abnormalities. Gluten powder 20 g/day was given in addition to an otherwise gluten-free diet. The children were reassessed as outpatients every two weeks, when a one-hour blood xylose test was performed. Repeat biopsy was performed when xylose absorption fell or after three months. Seventeen children had abnormal post-challenge biopsy appearances compatible with coeliac disease in relapse; 14 of these children completed their challenge within eight weeks. Seventeen children had completely normal biopsy appearances at the end of three months and were returned to a normal diet. One to two years later eight underwent repeat biopsies, which showed nothing abnormal. In only one child, the oldest in the series, were the histological findings equivocal. In the 17 children in whom coeliac disease was confirmed the duration of gluten challenge was not related to age, duration of gluten-free diet, histological findings on the pre-challenge biopsy, or HLA status.