Influenza A and B Nucleic Acid Detection (Upper Respiratory Specimen) – Probe-Based Test
This test checks for the presence of genetic material from influenza viruses (types A and B) in your upper respiratory tract. It helps determine if you have an active infection caused by these viruses.
["A quick way to identify flu infection using a simple nasal swab test."]
Key facts at a glance
- LOINC
- 91771-6
- Short code
- FLUAV Subtyp Upper resp NAA+probe
- Synonyms
- FLUAV Subtyp Upper resp 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
A healthcare provider collects a sample from your nose using a swab. The swab is then tested in a lab to detect genetic material from influenza viruses. This test uses a probe-based method to identify specific viral sequences, which helps confirm if you have an active flu infection.
What to Expect Before the Test
No special preparation is needed for this test. You may experience mild discomfort or slight irritation when the swab is inserted, but it usually takes only a few seconds. If you have a cold or congestion, it may be easier to collect the sample.
What to Expect After the Test
After the test, you can return to your normal activities immediately. There may be slight redness or mild discomfort at the site where the swab was inserted, but this typically resolves quickly. Avoid touching the swab area with your hands to prevent contamination.
Possible Results and Next Steps
If the test is positive, you likely have an active flu infection and may need antiviral medication. If negative, you do not currently have an active flu infection, but you may still be at risk if exposed to others. Follow-up with your healthcare provider if symptoms persist or worsen.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Influenza Virus Test (Nasal Swab)
Frequently asked questions
What does a positive result mean?
Can I get this test at home?
How soon will I get my results?
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