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Influenza A and B Nucleic Acid Detection (Serum/Plasma) by Qualitative Probe-Based Assay

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

This test checks for the presence of genetic material from influenza viruses A and B in your blood. It helps determine if you’ve recently been infected.

Quick summary

["A quick way to identify if the flu viruses are in your bloodstream, aiding in diagnosis and treatment planning."]

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

Key facts at a glance

LOINC
55464-2
Short code
FLUAV swine RNA Spec Ql NAA+probe
Synonyms
FLUAV swine RNA Spec Ql 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

What This Test Measures

The test detects genetic material (nucleic acids) from influenza A and B viruses using a molecular probe. It’s designed to confirm if these viruses are actively present in your serum or plasma, regardless of whether you’re experiencing symptoms.

How the Test Works

This is a qualitative test, meaning it provides a yes/no result. A positive result indicates the presence of influenza virus genetic material, which may suggest recent infection. The test does not measure virus quantity or severity.

When You Might Need This Test

Your healthcare provider may recommend this test if you have flu-like symptoms (e.g., fever, cough, body aches) and suspect exposure to influenza, especially during flu season. It can also be used in outbreak settings or for monitoring high-risk individuals.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample (serum or plasma) via venipuncture. The sample is processed in a lab to detect viral genetic material.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Influenza Virus Test (Serum/Plasma)

Frequently asked questions

This test helps confirm influenza infection quickly, which is important for starting antiviral treatments early. It can also guide decisions about isolation, vaccination, or further testing if needed.
This test result is qualitative and does not indicate the exact type of influenza virus or how severe your infection is. A positive result means the virus is present, but symptoms alone should not be relied upon for diagnosis.
This test is not used to diagnose chronic or long-term influenza effects. It only checks for recent infection.
The test may give false positives or negatives if you have recent exposure but no active infection, or if you’re taking certain medications that could interfere with the test.
If you have a weakened immune system, this test may not detect influenza as reliably as in others. Your provider may recommend additional testing or monitoring.
If you receive a positive result, follow your healthcare provider’s advice for treatment, such as antiviral medications or rest. If the result is negative but you still feel unwell, consult your provider for further evaluation.
  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