Nasal Swab Test
A nasal swab test checks for viruses and bacteria that cause respiratory infections, such as the flu, COVID-19, RSV, whooping cough, meningitis, and MRSA.
What this test measures
A nasal swab test checks for viruses and bacteria that cause respiratory infections. It takes a sample of cells from inside your nostrils or from the nasopharynx, the uppermost part of your nose and throat.
What your results mean
Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.
Higher-than-normal results
A positive result means a specific type of harmful virus or bacteria was found in your sample. If you are diagnosed with an infection, follow your provider's recommendations for treating your illness.
Frequently asked questions
What does a nasal swab test check for?
It checks for viruses and bacteria that cause respiratory infections, such as the flu, COVID-19, RSV, whooping cough, meningitis, and MRSA.
How is the sample collected?
The sample may be taken from inside your nostrils or from the nasopharynx, the uppermost part of your nose and throat.
What does a negative result mean?
A negative result means no harmful viruses or bacteria were found in your sample.
What does a positive result mean?
A positive result means a specific type of harmful virus or bacteria was found in your sample.
What should I do if I test positive?
Follow your provider's recommendations for treating your illness, which may include medicines and steps to prevent spreading the infection.
Related lab tests
Sources
- MedlinePlus: Nasal Swab — NIH MedlinePlus
Last updated . Information is aggregated from official public sources and is not a substitute for professional medical care.