Nasopharyngeal swab

A nasopharyngeal swab is a device used for collecting a sample of

Similar in concept to the cotton swab, a swab used for nasopharyngeal collection constitutes a narrow stick made of a short plastic rod that is covered, at one tip, with adsorbing material such as cotton, polyester, or flocked nylon. (Some swab handles have been made of nichrome or stainless steel wire.^[3][10]) The swab material used for a particular diagnostic application may vary based on the test type. Some research has shown that flocked swabs collect a larger volume of the sample material, when compared to fiber swabs.^[7][11]

Related methods

Slightly different but related is nasopharyngeal aspiration. Rather than depending on a physical swab to catch material from the nasopharynx, aspiration uses a catheter that is attached to a syringe. As with the swab method, the catheter is placed into the nostril and gently advanced to the nasopharynx, where approximately one to three milliliters of saline are introduced, followed by immediate re-aspiration of the saline—along with cells and secretions—back into the syringe.^[7] This aspiration method is often used when 1. the patient is an infant or elderly and 2. when the method is indicated as effective for a test type.^[6][12]

Diagrams

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  Diagram of the nasal cavity
• 
  Nasopharyngeal aspiration
• Collecting nasopharyngeal aspirate
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• Video of a nasopharyngeal swab test for COVID-19

See also

• Laboratory diagnosis of viral infections

References