Identification and Prevalence of Allergic, Nonallergic, and Local Allergic Rhinitis Patients in Western Area, Saudi Arabia

Objectives: To evaluate the diagnostic yield of skin prick test (SPT) and serum total immunoglobulin E (IgE) antibodies level in patients with allergic rhinitis (AR) and the role of nasal provocation test (NPT) for the determination of local allergic rhinitis (LAR) in patients with nonallergic rhinitis (NAR). Methodology: This multi-center study included 1230 patients with clinical manifestations for 2 years. Patients were classified according to the Allergic Rhinitis and Its Impact on Asthma (ARIA) and scored according to the quantitative Score for Allergic Rhinitis (SFAR). The SPT and total IgE antibody levels were done for all patients. Patients gave negative SPT underwent NPT, and its result was interpreted using Lebel Symptom Score Scale. Results: The SPT was positive in 77.8% of patients, mostly for grass pollen and dust mites. All patients were sensitive to multiple allergens. Median serum IgE antibody level for total study population was 162 IU/ml. Forty-two patients (3.4%) with negative SPT showed a weak response to NPT, while 231 patients (18.7%) with negative SPT had a high response to NPT and were considered to have LAR. Conclusion: The SPT could discriminate between AR and NAR patients. The NPT could identify LAR in 84.6% of patients with rhinitis among those considered as NAR.