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Influenza Virus Nucleic Acid Detection (Respiratory Specimen)

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

This test checks for the presence of the influenza virus in your throat or nasal secretions. It helps determine if you have an infection caused by the flu virus.

Quick summary

["Quickly identifies flu infection for faster treatment options."]

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

Key facts at a glance

LOINC
31861-8
Short code
FLUAV+FLUBV+FLUCV Ag Throat Ql
Synonyms
FLUAV+FLUBV+FLUCV 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

How the Test Works

A swab is gently collected from your throat or nasal passages. The sample is then tested for genetic material from the influenza virus using a molecular method, which can detect the virus even before symptoms appear.

What to Expect Before the Test

You may have no preparation needed, but avoid using nasal decongestants or sprays 24 hours before testing, as they could affect results.

Common Causes of False Results

False negatives may occur if the sample is collected too early or if the virus is not actively present. False positives are rare but can happen if other respiratory viruses are present or if there is contamination.

When You Might Need This Test

Your healthcare provider may recommend this test if you have flu-like symptoms (fever, cough, sore throat) or if you’re at higher risk for complications from the flu, such as young children, elderly adults, or those with chronic health conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is crucial for diagnosing influenza early, allowing for prompt antiviral treatment to reduce severity and duration of illness. It also supports public health efforts by identifying outbreaks and guiding preventive measures.

Short name

Influenza Test (Respiratory Swab)

Frequently asked questions

Why did my doctor order this test?
Your doctor may have ordered this test to confirm a flu diagnosis, especially if symptoms are mild or if other tests are inconclusive. It helps guide treatment decisions and monitor for complications.
What does a positive result mean?
A positive result means the test detected genetic material from the influenza virus, suggesting you likely have an active flu infection. Follow-up care with your healthcare provider may include antiviral medications.
How soon will I get my results?
Results are typically available within 24 to 48 hours, depending on lab processing times. Your healthcare provider will discuss the results with you.
  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