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Influenza Virus Nucleic Acid (Viral RNA) Detection by Nucleic Acid Amplification Test (NAAT) – Respiratory Specimen

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

This test checks for the genetic material of the influenza virus in your respiratory secretions, such as those collected from your throat or nasal passages, to help diagnose an influenza infection.

Quick summary

["A quick way to confirm if you have the flu and guide treatment decisions."]

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

Key facts at a glance

LOINC
31860-0
Short code
FLUAV+FLUBV Ag Throat Ql
Synonyms
FLUAV+FLUBV Ag Throat Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Doctors may order this test if you have flu-like symptoms (fever, cough, sore throat, body aches) and suspect influenza, especially during flu season or after exposure to someone with the flu. It helps distinguish flu from other illnesses like colds or COVID-19.

How the Test Works

A healthcare provider collects a sample from your throat or nasal passages using a swab. The sample is then tested in a lab to detect the presence of the influenza virus’s genetic material using a sensitive molecular technique.

What to Expect Before the Test

No special preparation is needed. You may have a slight sore throat after the swab, but it should resolve quickly. If you’re immunocompromised or have a weakened immune system, inform your provider before the test.

What to Expect After the Test

Results are typically available within 24 to 48 hours. You’ll receive a written report from your doctor or lab. If the test is positive, you may start antiviral medications sooner to reduce symptoms and complications.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Positive results confirm an active influenza infection and can guide treatment with antiviral drugs, which may shorten illness duration and reduce severity. Negative results help rule out flu and direct care toward other possible causes of symptoms. Early testing is especially important for high-risk groups (e.g., elderly, pregnant, or those with chronic illnesses).

Short name

Influenza Virus RNA (Respiratory Swab)

Frequently asked questions

How long does it take to get results from this test?
Results are usually ready within 24 to 48 hours, but this can vary by lab. Your healthcare provider will contact you once results are available.
Can I take antiviral medications if I get a negative result?
A negative result means the test did not detect the influenza virus at the time of testing. However, if you develop flu-like symptoms later, you may still consider antiviral medications if prescribed by your doctor, especially if symptoms worsen.
Is this test covered by insurance?
Coverage depends on your insurance plan and clinical indication. Check with your provider or insurance company to confirm if this test is covered under your plan, especially if you have symptoms that warrant testing.
  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