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[IgA endomysium antibodies. Detection in children with celiac disease]
S Wildfang1, M Knauss, M Stern
1Universitäts-Kinderklinik Tübingen.
Insights
IgA anti-endomysial antibodies (IgA-EmA) are a reliable, non-invasive screening test for coeliac disease in children. This test accurately diagnoses coeliac disease and monitors treatment effectiveness, even in very young patients.
Area of Science:
- Pediatric Gastroenterology
- Immunology
- Diagnostic Testing
Context:
- Coeliac disease diagnosis requires reliable, non-invasive methods.
- Epidemiological data highlights the need for effective screening tools.
- Current diagnostic approaches may be invasive or less accessible.
Purpose:
- To evaluate the diagnostic accuracy of IgA anti-endomysial antibodies (IgA-EmA) as a non-invasive screening test for coeliac disease in children.
- To assess the utility of IgA-EmA in monitoring treatment response in pediatric coeliac disease patients.
Summary:
- IgA-EmA testing demonstrated 100% sensitivity and specificity in diagnosing coeliac disease in children.
- The test showed high accuracy in distinguishing between coeliac disease patients and controls (99% specificity).
- IgA-EmA levels correlated with dietary adherence, declining on a gluten-free diet and rising during gluten challenge, indicating value in treatment monitoring.
Impact:
- Confirms IgA-EmA as a significant diagnostic marker for suspected coeliac disease in pediatric populations.
- Highlights the test's effectiveness in monitoring treatment and dietary compliance, even in children under two years old.
- Supports the use of IgA-EmA for non-invasive screening and management of coeliac disease, improving patient care.
Background:
Epidemiology of coeliac disease gives rise to the search for a non-invasive, reliable screening test.
Methods:
We looked for IgA anti-endomysial antibodies (IgA-EmA) in 103 sera of 90 children (age: 2 months-13.9 years) using an indirect immunofluorescence method on monkey oesophagus sections. In 44 patients, the diagnosis of coeliac disease was confirmed fulfilling new criteria of the European Society of Pediatric Gastroenterology and Nutrition.
Results:
All 24 coeliac disease patients with an initial flat mucosa had IgA-EmA (sensitivity 100%). In 36% of coeliac disease patients adhering to a gluten-free diet we found IgA-EmA. None of 46 patients in whom coeliac disease had been excluded by jejunal biopsy had IgA-EmA (specificity 100%). The sera of 102 blood-donors were used as controls and showed a test specificity of 99%. In coeliac disease patients, the titer of IgA-EmA declined during gluten-free diet by 0.66 steps/month on average, and rose 1.76 steps/month during gluten challenge.
Conclusions:
These results confirm the diagnostic significance of IgA-EmA for patients with suspected coeliac disease and their value for monitoring treatment even in young children (below 2 years).