Skip to content

Influenza A and B Viral Nucleic Acid Detection by Probe-Based Assay (Respiratory Specimen)

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

This test checks for genetic material from influenza A or B viruses in your respiratory secretions, helping identify if you have the flu.

Quick summary

["A quick way to confirm flu infection for treatment or isolation decisions."]

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

Key facts at a glance

LOINC
90456-5
Short code
FLUAV + FLUBV Pnl CSF NAA+probe
Synonyms
FLUAV + FLUBV Pnl CSF NAA+probe
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you have flu-like symptoms (e.g., fever, cough, body aches) or if you’ve been exposed to the flu. It’s often used in outbreaks, during flu season, or when other tests aren’t available.

How the Test Works

A swab is taken from your nose or throat. The sample is tested for genetic material (nucleic acids) from influenza viruses using a probe-based method, which detects their presence with high sensitivity.

What to Expect Before the Test

No special preparation is needed. You may feel mild discomfort from the swab, but it’s quick and painless. If you’re immunocompromised or have a nasal condition, let your provider know.

What to Expect After the Test

Results are typically available within 24 hours. If positive, you may need antiviral medication. If negative but symptoms persist, other causes (like COVID-19) may be tested next.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for early diagnosis, guiding treatment decisions (e.g., antiviral drugs), and controlling outbreaks. It’s especially useful in high-risk groups (e.g., elderly, immunocompromised) or settings like schools/hospitals where rapid identification is needed.

Short name

Viral Flu Screening (PCR)

Frequently asked questions

How long does it take to get results?
Results are usually ready within 24 hours, but some labs may take up to 48 hours depending on volume and testing location.
Can I still spread the flu if this test is negative?
Yes, you can still be contagious even if the test is negative. Follow your provider’s guidance on isolation (e.g., staying home for 5–7 days after symptoms start).
What if I have allergies to swabs or anesthesia?
If you have allergies, mention them to your provider. They may use a different swab type or adjust your care plan.
  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