Related Experiment Video
Updated: Feb 17, 2026
Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber
Published on: March 3, 2023
[Correlation of prick tests, RAST and food challenge tests in atopic dermatitis]
L de Seta1, P Siani, M Di Gruttola
128a Divisione Pediatria, Ospedale A. Cardarelli, Napoli, Italia.
Insights
Skin prick tests and Rast tests are reliable for diagnosing food allergies in atopic dermatitis (AD). However, only 25% showed agreement with food challenges, suggesting non-IgE mediated reactions are involved in AD.
Area of Science:
- Allergy and Immunology
- Dermatology
- Pediatric Allergy
Context:
- Atopic dermatitis (AD) is a common condition in children, often linked to food allergies.
- Prick skin testing is a widely accepted diagnostic tool for allergic diseases.
- The reliability and utility of prick testing in pediatric food allergy diagnosis require further evaluation.
Purpose:
- To assess the usefulness and reliability of prick skin tests and Rast tests in diagnosing food allergy-induced atopic dermatitis in children.
- To investigate the correlation between prick tests, Rast tests, and food challenge tests.
- To explore the pathogenetic mechanisms underlying food allergy in atopic dermatitis.
Summary:
- Prick and Rast tests demonstrated high concordance in results for diagnosing food allergy in atopic dermatitis.
- Copositivity between prick/Rast tests and food challenge tests was observed in only 25% of cases.
- This suggests that food allergy-related atopic dermatitis may involve non-IgE mediated immunoreactions alongside IgE-mediated pathways.
Impact:
- Highlights the limitations of relying solely on prick or Rast tests for diagnosing food allergy in AD.
- Emphasizes the importance of considering alternative immunoreactions in the pathogenesis of food allergy-related AD.
- Reinforces the role of elimination diets and food challenges as crucial diagnostic and therapeutic tools for food allergy-induced AD.
Abstract:
Prick skin allergometry is actually accepted as the best test for the diagnosis of allergic disease, being reliable and not invasive. Nevertheless questions about it use in children have been put forward. The aim of this study is to evaluate the usefulness and the reliability of prick and Rast tests for the diagnosis of atopic dermatitis due to food allergy. The correlations between Prick and Rast have been studied as well as their relation to the food challenge test. Prick and Rast tests results overlay in almost all cases, while in only 25% of cases there has been copositivity between Prick & Rast and the food challenge. This finding confirms that the pathogenetic mechanism involved in A.D. due to food allergy is not only IgE mediated, but it may also require alternative immunoreactions. Although the prick test is a simple, cheap and reliable method, the diagnosis of food allergy cannot rely solely on it. The diagnostic and therapeutic approach to food allergy borne A.D. is based upon elimination diet and food challenges.
