SARS-CoV-2 Nucleic Acid Test (Qualitative, Probe-Based)
This test detects genetic material from the virus that causes COVID-19, helping determine if you currently have an active infection.
["This test checks for the virus responsible for COVID-19, often used during diagnosis or monitoring."]
Key facts at a glance
- LOINC
- 95409-9
- Short code
- SARS-CoV-2 N gene Nose Ql NAA+probe
- Synonyms
- SARS-CoV-2 N gene Nose Ql NAA+probe
- Category
- chemistry
- 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
How the Test Works
The test uses a specialized probe to identify specific genetic sequences unique to the SARS-CoV-2 virus. If the virus is present in your sample, the probe will bind to its genetic material, triggering a detectable signal. This process is highly sensitive and designed to detect even small amounts of viral RNA.
Sample Collection
A nasal or throat swab is typically collected to gather cells and respiratory secretions that may contain the virus. The sample is then processed in a laboratory to extract viral genetic material for testing.
When You Might Need This Test
This test is commonly used for diagnosing active COVID-19 infections, especially when symptoms are present or after potential exposure. It may also be used during screening for travel, work, or other settings requiring COVID-19 testing.
What to Expect During Testing
You will likely have a quick, painless procedure where a healthcare provider collects a swab from your nose or throat. Results are usually available within 24 to 48 hours, depending on the laboratory’s processing time.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A positive result indicates the presence of the SARS-CoV-2 virus and suggests you may have an active infection. This can guide treatment decisions, isolation recommendations, and contact tracing efforts. A negative result means the test did not detect the virus at the time of testing, but it is not definitive proof of no infection. False negatives can occur, especially if testing is done too early in the illness. Follow-up testing may be recommended if symptoms persist or exposure is suspected.
Frequently asked questions
Why might I get this test?
What does a positive result mean?
Can I get a false negative result?
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