Eosinophils are a type of white blood cell. People who have
allergies, such as
allergic rhinitis, sometimes have more eosinophils in
their blood and other body fluids than do people who don't have allergies.
Nasal cytology, or a nasal smear test, checks for these cells. Doctors can use
the test to confirm a diagnosis of
The test is very simple. You blow your nose on a piece of plastic
wrap. A lab technician examines the nasal discharge under a microscope. If
there are many eosinophils, you may have allergies. Finding few eosinophils
(negative result), though, does not mean that allergies are not causing your
June 30, 2011
E. Gregory Thompson, MD - Internal Medicine & Rohit K Katial, MD - Allergy and Immunology
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