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Influenza Virus Genotyping (Serum/Plasma)

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

This test helps identify specific genetic variations (genotypes) of the influenza virus in your blood or plasma, which can inform treatment and vaccination strategies.

Quick summary

["Understanding your influenza virus genotype may help doctors tailor your care."]

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

Key facts at a glance

LOINC
57897-1
Short code
FLUAV+FLUBV NI resis Spec Genotyp
Synonyms
FLUAV+FLUBV NI resis Spec Genotyp
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
genotyping
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 doctor may order this test if you’ve recently been diagnosed with the flu, have symptoms that persist despite treatment, or if you’re in a high-risk group (e.g., elderly, immunocompromised). It helps determine which viral strains are present to guide further testing or treatment options.

How the Test Works

A small blood sample is taken, and the virus’s genetic material is analyzed using advanced laboratory techniques to detect and classify specific genetic sequences (genotypes) of the influenza virus.

Sample Collection

Blood is drawn from a vein in your arm. You may feel a slight pinch, but the process is quick and usually doesn’t cause discomfort. The sample is then sent to the lab for analysis.

What to Expect After the Test

Results are typically available within 24 to 72 hours. Your healthcare provider will discuss the findings with you, including any genotype details and next steps, such as targeted antiviral therapy or adjustments to your vaccination plan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Influenza Virus Genotype Screening

Frequently asked questions

How long does it take to get results from this test?
Results are usually available within 24 to 72 hours after the sample is processed in the lab.
Is this test covered by insurance?
Coverage depends on your insurance plan and medical necessity. Check with your provider or insurance company to confirm if this test is included in your benefits.
Can I fast before this blood test?
No fasting is required for this test, as it involves analyzing genetic material from your blood sample.
  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