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Influenza Virus Nucleic Acid Detection by Throat Swab (Qualitative)

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

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

Quick summary

["A quick way to confirm if your symptoms are from the flu virus."]

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

Key facts at a glance

LOINC
108603-2
Short code
FLUAV+FLUBV+FLUCV Ag Msmt Throat
Synonyms
FLUAV+FLUBV+FLUCV 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

Why This Test Is Done

Your healthcare provider may recommend this test if you have flu-like symptoms such as fever, cough, sore throat, body aches, or fatigue. It’s especially useful during flu season or if you’re at higher risk of complications from the flu.

How the Test Works

A swab is gently inserted into your throat to collect a sample. The sample is then tested in a lab to detect genetic material from the influenza virus using a molecular method (like PCR). If the virus is present, the test will show positive.

What to Expect Before the Test

No special preparation is needed. You may have a sore throat afterward, but this is normal. If you’re pregnant, have a weakened immune system, or are in close contact with someone who is sick, let your provider know before the test.

What to Expect After the Test

Results are usually available within 24 to 48 hours. If the test is positive, you may start antiviral medications sooner to reduce symptoms and prevent spreading the virus. If negative, you may still have the flu or another illness.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for diagnosing influenza early, especially in high-risk groups like elderly adults, children, or those with chronic health conditions. Early treatment can prevent complications such as pneumonia or hospitalizations. It also helps public health officials track flu outbreaks and guide prevention efforts.

Short name

Influenza Virus Test (Throat Swab)

Frequently asked questions

How long does it take to get the test results?
Results are typically ready within 24 to 48 hours, but some labs may provide them sooner. Your provider will contact you with the results once they are available.
Can I still get the flu even if my test comes back negative?
Yes, it’s possible. The test checks for the virus at the time of the sample, but you could have been infected earlier or have another illness causing similar symptoms. If symptoms persist, your provider may recommend retesting or other tests.
What should I do if I get a positive test result?
If your test is positive, follow your provider’s advice for treatment, which may include antiviral medications to reduce symptoms and shorten illness duration. Stay hydrated, rest, and avoid close contact with others to prevent spreading the virus.
  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