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Influenza A and B Nucleic Acid Detection (Upper Respiratory Specimen) – Probe-Based Test

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

This test checks for the presence of genetic material from influenza viruses (types A and B) in your upper respiratory tract. It helps determine if you have an active infection caused by these viruses.

Quick summary

["A quick way to identify flu infection using a simple nasal swab test."]

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

Key facts at a glance

LOINC
91771-6
Short code
FLUAV Subtyp Upper resp NAA+probe
Synonyms
FLUAV Subtyp Upper resp 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

How the Test Works

A healthcare provider collects a sample from your nose using a swab. The swab is then tested in a lab to detect genetic material from influenza viruses. This test uses a probe-based method to identify specific viral sequences, which helps confirm if you have an active flu infection.

What to Expect Before the Test

No special preparation is needed for this test. You may experience mild discomfort or slight irritation when the swab is inserted, but it usually takes only a few seconds. If you have a cold or congestion, it may be easier to collect the sample.

What to Expect After the Test

After the test, you can return to your normal activities immediately. There may be slight redness or mild discomfort at the site where the swab was inserted, but this typically resolves quickly. Avoid touching the swab area with your hands to prevent contamination.

Possible Results and Next Steps

If the test is positive, you likely have an active flu infection and may need antiviral medication. If negative, you do not currently have an active flu infection, but you may still be at risk if exposed to others. Follow-up with your healthcare provider if symptoms persist or worsen.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Influenza Virus Test (Nasal Swab)

Frequently asked questions

What does a positive result mean?
A positive result indicates that the test detected genetic material from influenza viruses in your upper respiratory tract, suggesting you have an active flu infection. This may require medical treatment to manage symptoms and reduce complications.
Can I get this test at home?
Some at-home rapid flu tests exist, but this specific probe-based test is typically performed in a clinical or laboratory setting. Your healthcare provider will determine the best approach for you.
How soon will I get my results?
Results are usually available within a few hours to a day, depending on the lab processing time. Your healthcare provider will discuss the results with you directly.
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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