Nasal Swab for SARS-CoV-2 Nucleic Acid Detection (Qualitative)
This test checks for the presence of the virus that causes COVID-19 in your nasal passages using a swab. It helps determine if you have an active infection.
["A nasal swab test can help diagnose COVID-19 by detecting the virus’s genetic material."]
Key facts at a glance
- LOINC
- 100689-9
- Short code
- T gondii DNA SerPl NAA+probe-Log#
- Synonyms
- T gondii DNA SerPl NAA+probe-Log#
- 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
A healthcare provider will insert a long, soft swab into your nose to collect a sample of mucus and cells. The swab is then sent to a lab for analysis to detect the virus’s genetic material (nucleic acids). This test is qualitative, meaning it only tells you whether the virus is present or not, not how much.
What to Expect Before the Test
You may experience mild discomfort or a slight burning sensation during the swab insertion, but it usually lasts only a few seconds. You can breathe normally afterward. If you have a cold or sinus congestion, it may make the procedure slightly more uncomfortable.
What to Expect After the Test
Most people don’t need any special care after the test. You may experience mild nasal irritation or a slight runny nose for a short time. If you experience severe pain, bleeding, or other concerning symptoms, contact your healthcare provider.
When This Test Is Used
This test is typically used for diagnosing active COVID-19 infection, especially in people with symptoms like fever, cough, or difficulty breathing. It may also be used in screening or surveillance settings, such as before travel or in high-risk environments.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A positive result indicates the presence of SARS-CoV-2, strongly suggesting an active COVID-19 infection. A negative result means the virus was not detected in the sample at the time of testing, but it does not rule out infection if symptoms persist. This test is most reliable when performed early in the illness. Results should be interpreted by a healthcare provider in the context of your symptoms and medical history.
Frequently asked questions
What does a positive result mean?
Can a negative result mean I don’t have COVID-19?
How soon after exposure should I get tested?
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