Skip to content

Influenza Nucleic Acid Test (Respiratory Probe)

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

This test checks for the presence of genetic material from the influenza virus in your respiratory secretions, helping determine if you have an active infection.

Quick summary

["Quickly identifies flu viruses to guide treatment and isolate you safely."]

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

Key facts at a glance

LOINC
81308-9
Short code
FLUAV RNA Ct Resp Qn NAA+probe
Synonyms
FLUAV RNA Ct Resp Qn 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

Why This Test Matters

Influenza (the flu) is a contagious respiratory illness caused by viruses. This test detects the virus’s genetic material (RNA) in your nasal or throat swab, which can help confirm if you have an active flu infection—even before symptoms appear. Early detection allows for prompt treatment and reduces the risk of spreading the virus to others.

How the Test Works

A swab is taken from your nose or throat. The sample is tested using a molecular method (nucleic acid amplification test) to identify influenza virus RNA. This process is highly sensitive and can detect even small amounts of the virus.

What to Expect Before the Test

No special preparation is needed. You may feel mild discomfort from the swab, but it typically takes only a few seconds. If you have a cold or respiratory symptoms, this test is especially useful to confirm flu rather than other illnesses.

What to Expect After the Test

After the test, you may experience mild irritation or discomfort at the site of the swab. You can return to your normal activities immediately. If you develop flu-like symptoms after testing negative, consult your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Influenza RNA Detection

Frequently asked questions

How soon will I get my results?
Results are typically available within 24 hours, though some labs may provide results sooner. Follow up with your healthcare provider if you have questions about your results.
What if my test is positive for influenza?
A positive test means you likely have an active flu infection. Your doctor may recommend antiviral medications to shorten the duration of symptoms and reduce complications. Rest, stay hydrated, and follow your doctor’s advice for managing symptoms.
Can I still spread the flu even if my test is negative?
Yes, it’s possible to spread the flu even if your test is negative, especially in the early stages of infection. Flu symptoms can appear 1–4 days after exposure, so it’s important to practice good hygiene (like washing hands) and avoid close contact with others until you’ve recovered.
  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