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Nasal Swab
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lab Tests

Nasal Swab

A nasal swab is a diagnostic test used to collect samples from the nose or throat to identify viruses and bacteria causing respiratory infections.

What is a nasal swab used for?

Nasal swabs help diagnose various respiratory infections, including:

  • The flu
  • COVID-19
  • Respiratory syncytial virus (RSV)
  • Whooping cough
  • Meningitis
  • MRSA (methicillin-resistant Staphylococcus aureus)

Why do I need a nasal swab?

You may need this test if you exhibit symptoms of a respiratory infection, such as a cough, fever, sore throat, fatigue, muscle aches, or a stuffy/runny nose.

What happens during a nasal swab?

There are three primary methods for collecting the sample:

  • Anterior nares: Swabbing the front part of the nostrils.
  • Nasal mid-turbinate (NMT): Swabbing the back of the nostrils.
  • Nasopharyngeal (NP) swab: A deeper swab reaching the nasopharynx (the upper part of the throat). This must be performed by a provider and is more effective for detecting certain pathogens.

During the procedure, you will tilt your head back while the swab is inserted and rotated for 10–15 seconds. The process may be repeated in the second nostril to ensure an adequate sample.

What do the results mean?

  • Negative result: No harmful viruses or bacteria were detected in your sample.
  • Positive result: A specific harmful virus or bacteria was found. Your provider will recommend treatment based on the specific infection identified.

Frequently Asked Questions

negative result means the specific pathogen the test targets was not detected, but it does not rule out other infections or a false‑negative early in illness. Contact your clinician for further evaluation, possible repeat testing, or alternative diagnostics (e.g., throat culture, chest X‑ray).
For most viral respiratory infections (e.g., COVID‑19, influenza, RSV), the highest viral load is in the first 3‑5 days of symptoms. Collecting a swab within this window maximizes sensitivity; testing later can still be useful but may yield more false‑negatives.
Self‑collected anterior nasal swabs are authorized for many home‑test kits and have comparable sensitivity to provider‑collected nasopharyngeal swabs when performed correctly. Follow the kit instructions precisely—insert the swab about 1‑1.5 cm into each nostril, rotate for the recommended time, and avoid touching the tip.
Yes. Recent use of nasal sprays (especially steroid or antihistamine sprays), nasal irrigation, or vigorous blowing can reduce the amount of viral material on the swab and lower test sensitivity. Ideally, avoid nasal sprays for at least 30 minutes before collection and refrain from blowing your nose immediately prior to the swab.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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