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

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

This test checks for the presence of the influenza virus in your throat swab to help diagnose flu symptoms.

Quick summary

["Determines if the flu virus is causing your respiratory illness."]

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

Key facts at a glance

LOINC
108604-0
Short code
FLUAV+FLUBV Ag Msmt Throat
Synonyms
FLUAV+FLUBV Ag Msmt Throat
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

What This Test Measures

The test detects genetic material (RNA) from the influenza virus. If the virus is present, the test can identify it through a molecular process that amplifies and analyzes the viral RNA.

How the Test Is Collected

A healthcare provider will take a swab from the back of your throat to collect a sample. This is a quick, painless procedure that usually doesn’t require any special preparation.

Why It’s Done

Doctors may order this test if you have flu-like symptoms such as fever, cough, sore throat, body aches, or fatigue, especially during flu season. It helps confirm whether your symptoms are due to the flu or another illness.

What to Expect After the Test

Results are typically available within 24 hours. If the test is positive, you may receive antiviral medications sooner to help reduce symptoms and prevent complications. If negative, other causes of illness may be considered.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Influenza Virus Test

Frequently asked questions

How soon can I expect results?
Results are usually ready within 24 hours, but timing can vary by lab. Your healthcare provider will contact you once results are available.
What if my test is positive?
A positive test means you likely have the flu. Your doctor may recommend antiviral medications to shorten the duration of symptoms and reduce severity. Rest, hydration, and over-the-counter medications for symptoms can also help.
Can I still spread the flu if my test is negative?
Even if your test is negative, you might still be contagious if you’ve been exposed to the flu recently. Follow your doctor’s advice on isolation and precautions for at least 24 hours after symptoms improve.
  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