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Influenza Virus Nucleic Acid Detection by Probe-Based Assay (Serum/Plasma)

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

This test checks for genetic material from the influenza virus in your blood. It helps determine if you have an active infection with one of the flu strains.

Quick summary

["Determines if the flu virus is present 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
49528-3
Short code
FLUAV H9 RNA Spec Ql NAA+probe
Synonyms
FLUAV H9 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

How the Test Works

The test uses a specialized probe to detect genetic material (RNA) from the influenza virus in your blood sample. This is done through a molecular method that identifies the virus’s unique genetic signature, even if it’s in very small amounts.

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have flu-like symptoms (e.g., fever, cough, body aches) and suspect influenza, especially if you’re at higher risk for complications. It can also be used to confirm a diagnosis in certain clinical settings.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The sample is collected in a tube containing an anticoagulant to prevent clotting.

What to Expect During the Test

The blood sample is processed in a lab to extract viral RNA. The probe-based assay detects the presence of influenza RNA, which is then analyzed for confirmation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Influenza RNA Probe Test

Frequently asked questions

When 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.
What does a positive result mean?
A positive result indicates the presence of influenza virus RNA in your blood, strongly suggesting an active infection. This confirms the need for antiviral treatment and further monitoring.
What if I have a negative result?
A negative result means the test did not detect influenza RNA in your sample. However, symptoms may still persist, so it’s important to follow up with your healthcare provider to rule out other causes or retest if symptoms worsen.
  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