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Influenza A Virus Nucleic Acid Detection by Reverse Transcription Polymerase Chain Reaction (RT-PCR) on Respiratory Specimen

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

This test checks for the genetic material of Influenza A virus in a sample taken from your respiratory tract, such as nasal or throat swabs.

Quick summary

["Helps diagnose influenza infection quickly and guides treatment decisions."]

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

Key facts at a glance

LOINC
87715-9
Short code
FLUAV HA gene Islt-Seq
Synonyms
FLUAV HA 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

Doctors may order this test if you have symptoms like fever, cough, sore throat, body aches, or fatigue that could be caused by the flu. It’s especially useful for people at higher risk of complications, such as young children, older adults, or those with chronic health conditions.

What to Expect Before the Test

You’ll likely have a quick nasal or throat swab. No special preparation is needed, but inform your provider if you’re taking certain medications or have allergies to swabs.

What the Test Results Mean

A positive result means the test detected Influenza A virus genetic material, suggesting you may have an active infection. A negative result means the test did not find the virus at the time of testing, but infection could still be present or may have resolved.

How the Test Works

The test uses a process called RT-PCR to identify the virus’s genetic material. A small sample of your respiratory secretions is collected and analyzed in a lab to detect specific viral sequences.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Influenza A Virus RT-PCR (Respiratory)

Frequently asked questions

How soon can I expect results?
Results are typically available within 24 hours, though some labs may provide them sooner. Follow-up with your healthcare provider for interpretation.
What if I test positive for Influenza A?
If positive, your doctor may recommend antiviral medications to shorten illness duration and reduce complications. Rest, hydration, and over-the-counter pain relievers can also help manage symptoms.
Can I get the flu even if this test is negative?
Yes, a negative result means the test did not detect the virus at the time of testing, but you could still be infected. Symptoms may take time to develop, or the virus may have cleared before testing. Stay alert for flu-like symptoms and consult your provider if concerned.
  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