Diagnostic performance of the atopy patch test with inhalant allergens.

Area of Science:

• Allergy and Immunology
• Dermatology
• Pediatrics

Background:

• Atopic dermatitis (AD) often co-exists with respiratory symptoms (RS).
• Accurate diagnosis of inhalant allergen sensitization is crucial for managing AD with RS.
• Evaluating diagnostic tests for sensitization in this population is important.

Purpose of the Study:

• To compare the diagnostic performance of the atopy patch test (APT) against skin prick testing (SPT) and in vitro IgE measurements.
• To assess these tests in a large cohort of pediatric patients with atopic dermatitis and/or respiratory symptoms.

Main Methods:

• Included 521 pediatric patients with AD and/or RS, plus 53 healthy controls.
• All participants underwent APT, SPT, and CAP/RAST for common inhalant allergens.
• Calculated specificity, positive, and negative predictive values using control group data.

Main Results:

• APT demonstrated significantly higher positive results compared to SPT and CAP/RAST (P < .0001).
• APT showed high specificity (96.2%) in controls, outperforming SPT (88.4%) and CAP/RAST (92.5%).
• Significant differences in APT performance were observed across various clinical presentation groups.

Conclusions:

• The atopy patch test (APT) exhibits superior diagnostic accuracy in pediatric patients with AD and RS.
• APT is a more effective tool than SPT and in vitro IgE for diagnosing inhalant allergen sensitization in this specific patient group.