Influenza Virus Nucleic Acid (RNA) Detection by Probe-Based Assay (Serum/Plasma)
This test checks for genetic material from the influenza virus in your blood. It helps determine if you have an active flu infection.
["A flu test from your blood can help doctors diagnose whether you have the flu virus causing symptoms like fever, cough, or fatigue."]
Key facts at a glance
- LOINC
- 105232-3
- Short code
- FLUAV+FLUBV RNA Spt Ql NAA+probe
- Synonyms
- FLUAV+FLUBV RNA Spt Ql NAA+probe
- Category
- chemistry
- Sample
- sputum
- Container
- Sterile sputum container
- Units
- N/A
- Ref low
- 0.8
- Ref high
- 1.2
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- probe-amp-tar
- CPT
- 85610
- SNOMED
- 396252006
- Specimen volume
- 3-5 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h
- TAT
- 4–24 hours
- Order
- routine
How the Test Works
The test uses a specialized probe to detect the RNA of the influenza virus in your serum or plasma. This is done through a molecular method that identifies viral genetic material, even if the virus isn’t yet causing symptoms.
What to Expect Before the Test
No special preparation is needed. You may have a blood draw at a clinic, doctor’s office, or lab. If you’re taking blood thinners, let your healthcare provider know beforehand.
Possible Results and Next Steps
A positive result means the test found influenza virus RNA, suggesting you may have an active flu infection. A negative result means no detectable viral RNA was found at the time of testing. Follow-up testing or symptoms may guide further action.
When This Test Might Be Ordered
Your doctor may recommend this test if you have flu-like symptoms (e.g., fever, muscle aches, sore throat) and suspect influenza, especially if you’re at higher risk for complications (e.g., elderly, immunocompromised, or pregnant).
Reference range
INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A
Inform your healthcare provider if you are taking blood thinners. No special preparation required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test provides a quick and precise way to diagnose influenza early. Early detection can help guide treatment decisions, such as antiviral medications, which may reduce severity or shorten illness duration. It’s particularly useful in outbreaks or when symptoms overlap with other conditions.
Short name
Influenza RNA Test
Frequently asked questions
What does a positive result mean?
How soon can I expect results?
Can I get this test at home?
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