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The Nasal Smear For Eosinophils Test is a diagnostic test that uses a dye named eosin to stain the white blood cells in the nasal smear sample. The Eosinophils, which constitute around 1-3% of the WBCs, possibly function during allergic responses and also resist certain infections 1. The test is simple, non-invasive, and economical to diagnose allergic rhinitis than blood eosinophil count 2. No special preparation is needed for this test 1
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