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[Diagnosing allergic reactions to ingested wheat in children]
Marianne H Aas1, Ragnhild Halvorsen
1Voksentoppen, Rikshospitalet, 0791 Oslo. marianneaas2@yahoo.no
Summary
Specific IgE tests for wheat allergy are not yet reliable for distinguishing severe reactions from mild or no reactions. Oral challenge tests remain essential for accurate diagnosis of severe wheat allergy.
Area of Science:
- Allergy and Immunology
- Pediatric Allergy
- Diagnostic Testing
Context:
- Wheat sensitization, indicated by specific IgE, is common but doesn't always correlate with clinical reactions.
- Diagnosing severe wheat allergy historically required oral challenge tests.
- Differentiating between mild and severe clinical reactions to wheat has been a diagnostic challenge.
Purpose:
- To evaluate the utility of three specific IgE tests (f4, f79, f98) in differentiating wheat allergy severity in children.
- To determine if IgE levels against different wheat components can predict clinical outcomes.
Summary:
- Twenty-nine children with elevated wheat-specific IgE (f4) underwent further testing, including IgE against f4, f79, and f98, alongside oral provocation tests.
- Children with severe reactions showed high, comparable IgE levels across all three tests.
- Children with mild reactions had varying IgE levels but similar results between tests, while those with negative challenges showed diverse IgE patterns.
Impact:
- Current specific IgE tests are insufficient to differentiate between severe, mild, or absent clinical reactions to ingested wheat.
- Oral challenge tests remain the gold standard for diagnosing severe wheat allergy.
- This study highlights the limitations of serological tests in managing wheat allergy and emphasizes the continued need for clinical provocation in diagnosis.