SARS-CoV-2 Nucleic Acid Detection in Nasopharyngeal Swab (Qualitative PCR)
This test checks for the genetic material of COVID-19 in a sample taken from your nose. It helps determine if you currently have an active infection.
["A COVID-19 PCR test can confirm if you're infected with the virus at the time of testing."]
Key facts at a glance
- LOINC
- 76581-8
- Short code
- S pyogenes csrS Swab Ql NAA+probe
- Synonyms
- S pyogenes csrS Swab Ql NAA+probe
- Category
- coagulation
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- probe-amp-tar
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your healthcare provider may order this test if you have symptoms like fever, cough, or difficulty breathing, or if you’ve been exposed to someone with COVID-19. It’s also used in screening for outbreaks or before travel or procedures that require negative test results.
How the Test Works
A healthcare worker collects a sample from your nasal passage using a swab. The swab is then sent to a lab, where scientists use a special process called PCR to detect the virus’s genetic material. This test is highly sensitive and can detect very small amounts of the virus.
What to Expect Before the Test
You may need to avoid using nasal sprays, decongestants, or blowing your nose for a few hours before the test. Wear a mask if you’re feeling unwell, and let your provider know if you’re pregnant or have any allergies.
What to Expect During the Test
The test is quick and usually painless. You’ll sit comfortably while the swab is gently inserted into your nose. You might feel a slight tickle or discomfort, but it shouldn’t last long.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is critical for diagnosing active COVID-19 infections. A positive result means you likely have the virus and should isolate to prevent spreading it to others. A negative result doesn’t always mean you’re completely clear—it could mean you’re in the early stages of infection or the virus is no longer detectable. Follow-up testing or monitoring may be needed.
Short name
SARS-CoV-2 PCR Test (Nasal Swab)
Frequently asked questions
How long does it take to get results?
What if I get a positive result?
Can I still get COVID-19 after a negative test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy