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Influenza A or B Nucleic Acid Detection by Probe-Based Assay (Respiratory Specimen)

Published: August 9, 2026Updated: August 16, 2026

This test checks for the presence of genetic material from influenza viruses (A or B) in your respiratory secretions, such as nasal swabs or throat swabs. It helps determine if you have an active infection.

Quick summary

["This test quickly identifies flu viruses to guide treatment and reduce spread."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
60494-2
Short code
FLUAV H1 2009 RNA Spec NAA+probe-Imp
Synonyms
FLUAV H1 2009 RNA Spec NAA+probe-Imp
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

Why This Test Is Done

Your healthcare provider may order this test if you have flu-like symptoms (fever, cough, sore throat, body aches) or if you’ve been exposed to someone with the flu. It’s especially useful in high-risk groups like the elderly, young children, or those with chronic health conditions.

How the Test Works

A swab is taken from your nose or throat to collect respiratory secretions. The sample is then analyzed for genetic material (RNA) from influenza viruses using a probe-based method, which detects the virus quickly and accurately.

What to Expect Before the Test

No special preparation is needed. You may have a nasal or throat swab, which is quick and painless. If you’re using nasal swabs, you might experience a slight tickle or discomfort.

What to Expect After the Test

The results are typically available within hours. You’ll receive a report indicating whether the test was positive for influenza RNA or negative. Follow-up care may include antiviral medications if needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Positive results confirm an active influenza infection and help healthcare providers start appropriate treatment (like antiviral drugs) sooner. Negative results mean the virus isn’t detected in this sample, but symptoms could still be due to other causes or resolve naturally. This test is critical for public health monitoring, especially during flu seasons or outbreaks.

Short name

Influenza Virus RNA Probe Test

Frequently asked questions

How soon can I expect results?
Results are usually available within a few hours to a day, depending on lab processing times. Your healthcare provider will contact you directly with the outcome.
Can I have false positives or false negatives with this test?
Like any test, there’s a very low chance of false results. However, false negatives can occur if the sample isn’t collected properly or if the virus isn’t actively replicating at the time of testing. False positives are rare but possible if contamination occurs.
Does this test replace a viral culture?
No, this test detects viral RNA but doesn’t identify the specific strain of influenza. A viral culture may be used later to determine the exact type of virus for targeted treatment or research purposes.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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