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TOPLINE:

A nasal allergy test showed strong diagnostic performance, with sensitivity exceeding 75% and specificity approaching 90% for detecting allergens sensitized in patients with allergic rhinitis.

METHODOLOGY:

• Researchers conducted a prospective study between 2010 and 2012 to evaluate the diagnostic performance of a nasal allergy test that directly detects allergen-specific immunoglobulin E (IgE) in the nasal mucosa.
• They included 102 patients (mean age, 41 years; 65.7% women) with allergic rhinitis and 60 individuals without the condition (mean age, 41 years; 50% women).
• All participants underwent nasal testing using prepared inhalant allergy panels, and allergen-specific IgE was quantified using the enzyme-linked immunosorbent assay.
• A bilateral applicator delivered up to eight specific allergens — tree pollen mix, grass pollen mix, weed pollen mix, ragweed, house dust mix, mold mix, feather mix (containing feathers from a goose, chicken, duck, and pigeon), and epithelium mix (containing epithelium from a cat, horse, cow, and dog) — directly onto the nasal lining.

TAKEAWAY:

• The nasal allergy test delivered strong diagnostic performance across all allergens, with sensitivity ranging from 0.60 to 0.94, meaning correct identification of more than 75% of patients with allergic rhinitis. The specificity ranged from 0.75 to 0.98, indicating correct exclusion of nearly 90% of control individuals.
• The positive likelihood ratio for the allergens studied ranged from 3.75 to 34.59, indicating that a positive result was more likely in patients with allergic rhinitis than in those without the condition. The negative likelihood ratio ranged from 0.08 to 0.42, indicating that a negative result was more likely in patients without allergic rhinitis.
• The nasal allergy test showed a positive predictive value ranging from 0.86 to 0.98, meaning that over 90% of positive results confirm true allergy. The negative predictive value ranged from 0.58 to 0.88, indicating over 70% of negative results rule out the disease.

IN PRACTICE:

“These findings highlight the nasal allergy test's strength in correctly identifying allergic individuals, especially when used for allergens with high LR+ [positive likelihood ratio] values,” the authors wrote. “However, its moderate NPV [negative predictive value] underscores the need for cautious interpretation in low-prevalence settings,” they added.

SOURCE:

Maida Šljivić Husejnović, MD, with the University of Tuzla, Tuzla, Bosnia and Herzegovina, was the corresponding author of this study, which was published online on September 4 in International Archives of Allergy and Immunology.

LIMITATIONS:

This study was limited by a small sample size, the semi-quantitative nature of the nasal IgE assay, and prior use of antihistamines or corticosteroids by participants that might have influenced nasal IgE levels. Additionally, the absence of longitudinal follow-up may have restricted the ability to assess changes in sensitization over time.

DISCLOSURES:

The authors reported having no conflicts of interest.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.