Rhinosinusitis laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Dima Nimri, M.D. [2]

Overview

There are several lab findings associated with rhinosinusitis, but these findings are nonspecific.

Laboratory Findings

The following laboratory tests can be done when suspecting rhinosinusitis, but a positive result is unspecific:

• Complete blood count (CBC), to detect for the presence of an infection
• Erythrocyte sedimentation rate (ESR)
• Sweat chloride test, to exclude cystic fibrosis
• Serum immunoglobulins, to exclude underlying immunodeficiency
• Allergy testing (Radio-Allergo-sorbent Test (RAST)) may be done in cases of chronic sinusitis or acute recurrent sinusitis