When hay fever doesn't quit. Diagnosing seasonal and perennial allergic rhinitis.
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Анотація
Seasonal allergic rhinitis is usually easily diagnosed by the seasonal nature of characteristic symptoms combined with evidence of appropriate specific IgE antibodies. Perennial allergic rhinitis, however, may present a diagnostic challenge. The physician may find IgE antibodies to allergens perennially encountered by the patient and should look for other causes of chronic rhinitis. Examination of nasal secretions can be a diagnostic aid, but measurements of eosinophils and total IgE in serum have limited diagnostic value.