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Allergic rhinitis is one of the most common respiratory diseases. Patient with allergic rhinitis may have elevated level of serum IgE and eosinophil than normal person. Nasal smear eosinophil count is a simple test as well as noninvasive, can be repeated and inexpensive method for diagnosis of allergic rhinitis.   Objective: To assess the eosinophil count in nasal smear as an alternative diagnostic test for children with allergic rhinitis.   Methods: This cross-sectional study was conducted at the Department of Laboratory medicine and Paediatrics, BSMMU, Dhaka from September 2019 to August 2020 in 120 children (Age up to 18 years both sex). Diagnosed patients of allergic rhinitis according to ARIA-WHO guideline with history and clinical feature who fulfilled the inclusion criteria were selected as study population. After taking informed written consent blood and nasal secretion of allergic patient were drawn for serum IgE and eosinophil count. Nasal smears for eosinophil were stained using Giemsa stain and observed eosinophil under light microscope. Peripheral blood eosinophil count was estimated by hematology auto-analyzer (SYSMEX-XN 2000) and rechecked manually. The serum total IgE level was performed based on sandwich principle of ELISA.   Results: The serum IgE level, nasal smear eosinophil count and blood eosinophil count were found increased with severity of allergic rhinitis, which was statistically significant (p&lt;0.001). Pearson’s correlation coefficient test revealed significant positive correlation between nasal smear eosinophil count with serum IgE (r= +.656, p&lt;0.001) and blood absolute eosinophil count (r= +.415, p&lt;0.001).   Conclusion: Nasal smear eosinophil count was significantly raised alone with absolute eosinophil count and serum IgE level with the severity of allergic rhinitis in children.

Study of Eosinophil Count in Nasal and Peripheral Blood Smear Compare with Serum IgE Level in Children with Allergic Rhinitis