Influenza Virus Nucleic Acid Detection by Nucleic Acid Amplification Test (Viral RNA)
This test checks for genetic material from the flu virus in your throat swab to help diagnose an active infection.
["A quick way to confirm if you have the flu based on recent symptoms and exposure risk."]
Key facts at a glance
- LOINC
- 6435-2
- Short code
- FLUAV+FLUBV Ag Throat Ql IA
- Synonyms
- FLUAV+FLUBV Ag Throat Ql IA
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- 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 flu-like symptoms (fever, cough, sore throat, body aches) within days of possible exposure to the flu. It’s also used to confirm flu in patients with severe illness or complications, or in high-risk groups like the elderly or those with chronic health conditions.
How the Test Works
A swab is taken from the back of your throat or nose to collect a sample. The sample is tested for genetic material (RNA) from the flu virus using a lab technique that detects and amplifies tiny amounts of viral DNA/RNA.
What to Expect Before the Test
No special preparation is needed. You may have mild throat discomfort from the swab, but it usually doesn’t require any downtime. If you’re immunocompromised or have a weakened immune system, let your provider know before the test.
What to Expect After the Test
The results are typically available within 24–48 hours. You may receive a call or email with the results, but follow-up instructions will be provided by your healthcare team.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Viral RNA (Influenza)
Frequently asked questions
This test helps confirm if you have an active flu infection, which is important for starting antiviral medications early if needed. It also supports decisions about isolation, treatment plans, and public health monitoring of flu outbreaks.
The test is highly sensitive and specific when performed correctly, but results may vary depending on the timing of sample collection relative to symptom onset.
No, this test does not provide information about past flu infections or immunity. It only detects current viral presence in your throat or nasal passages.
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