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[Value (and limitations) of the RAST fx5 in pediatric allergological practice]
1Unité de Pathologie Respiratoire et d'Allergologie, Hôpital Saint-Vincent-de-Paul, Paris.
Insights
The RAST f x 5 assay identified wheat, peanut, and soybean as common food allergens in children with respiratory issues. This cost-effective screening tool aids in diagnosing potential allergies, though clinical justification needs further study.
Area of Science:
- Allergy and Immunology
- Pediatric Respiratory Medicine
- Clinical Diagnostics
Context:
- Respiratory pathologies in children and adolescents are often linked to allergic conditions.
- Accurate diagnosis of food allergies is crucial for effective management.
- The RAST f x 5 assay offers a multiplexed approach to in vitro food allergen testing.
Purpose:
- To evaluate the efficacy and cost-effectiveness of the RAST f x 5 assay in a pediatric population with suspected allergic respiratory diseases.
- To identify common food allergens contributing to respiratory symptoms in children and adolescents.
- To compare clinical characteristics between test-negative and test-positive individuals.
Summary:
- A total of 400 children and adolescents with respiratory symptoms underwent testing with the RAST f x 5 assay.
- Positive reactions were most frequent for wheat, peanut, and soybean antigens.
- The assay demonstrated a reduction in the cost of systematic food allergen screening.
Impact:
- The RAST f x 5 assay provides a cost-effective initial screening for food allergens in pediatric respiratory conditions.
- Identifies key plant-based food allergens (wheat, peanut, soybean) implicated in allergic respiratory diseases.
- Highlights the need for further clinical validation to establish the definitive utility of widespread food allergen testing.
Abstract:
RAST f x 5 (CAP-system, Pharmacia), an in vitro assay testing a mixture of 6 food antigens, was systematically applied to 400 children and adolescents with respiratory pathologies possibly of allergic origin. The clinical aspects of the 293 test-negative patients were compared with those of the 107 positive cases. Furthermore, 84 positive sera were also evaluated against each of the 6 antigens regrouped in the f x 5. In this population with allergic respiratory diseases, the most frequently positive tests reacted with antigens of plant origins: wheat, peanut and soybean. From an economic point of view, first-line use of f x 5 markedly reduced the cost of a systematic study of food allergens, whose clinical justification remains to be demonstrated.