Respiratory Syncytial Virus (RSV) Tests Test

An RSV test checks a fluid sample from your nose to see if the respiratory syncytial virus is causing your symptoms.

What this test measures

RSV testing checks a fluid sample from your nose to see if the virus is in your body and causing symptoms of a respiratory infection. Two common types are rapid antigen tests (look for virus proteins) and molecular RT-PCR tests (look for genetic material).

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 you likely have an RSV infection.

Lower-than-normal results

A negative result means no signs of the virus were found, but it does not rule out RSV because there may not have been enough virus in the sample.

Frequently asked questions

What does an RSV test measure?

It checks a fluid sample from your nose for signs of the respiratory syncytial virus.

Who should get an RSV test?

Infants, older adults, and people with weakened immune systems who have moderate to severe cold symptoms.

How long does it take to get results?

Rapid antigen tests can provide results in an hour or less. RT-PCR tests are usually sent to a lab and take longer.

What does a positive RSV test mean?

It means you likely have an RSV infection.

Can a negative test rule out RSV?

No, a negative test does not rule out RSV because there may not have been enough virus in the sample to detect.

Sources

MedlinePlus: Respiratory Syncytial Virus (RSV) Tests — NIH MedlinePlus

Last updated July 7, 2026. Information is aggregated from official public sources and is not a substitute for professional medical care.