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Influenza A/B Viral Gene Detection by Sequencing (Serum/Plasma)

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

This test checks for genetic material from influenza viruses (types A or B) in your blood. It helps determine if you have an active infection.

Quick summary

["This test helps diagnose influenza (the flu) by detecting its genetic material in your blood."]

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

Key facts at a glance

LOINC
93759-9
Short code
FLUAV PB2 gene Islt-Seq
Synonyms
FLUAV PB2 gene Islt-Seq
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
sequencing
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 order this test if you have flu-like symptoms (such as fever, cough, or body aches) and suspect you might have the flu. It can also be used to confirm a diagnosis when other tests are inconclusive or if you’re at higher risk of complications from influenza.

How the Test Works

The test involves collecting a blood sample and analyzing a small piece of genetic material (RNA) from the influenza virus. This process uses advanced sequencing technology to identify specific viral sequences that match known influenza strains.

Sample Collection and Preparation

A healthcare professional will draw blood from a vein in your arm. The blood is then processed to isolate the viral RNA, which is sent to a lab for sequencing. This process typically takes a few days to complete, depending on lab workload.

What to Expect Before the Test

There are no special preparations needed for this test. You may have some mild discomfort from the needle, but it usually goes away quickly. If you’re on blood-thinning medication, let your provider know before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Viral RNA Test

Frequently asked questions

How long does it take to get results from this test?
Results from this test typically take several days to a week, depending on the lab’s processing schedule. Your healthcare provider will contact you once the results are ready.
What does a positive result mean?
A positive result means the test detected genetic material from influenza A or B viruses in your blood, indicating an active infection. You may need antiviral medications to help manage your symptoms and prevent complications.
Can this test be used for prevention or vaccination purposes?
No, this test is for diagnosing an active influenza infection. It does not replace vaccination or other preventive measures like hand hygiene and staying home when sick.
  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