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Influenza Virus Nucleic Acid Detection by Qualitative Polymerase Chain Reaction (Serum/Plasma)

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

This test checks for the presence of genetic material from the influenza virus in your blood. It helps determine if you have an active infection caused by influenza.

Quick summary

["A positive result may indicate recent influenza infection requiring medical evaluation or treatment."]

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

Key facts at a glance

LOINC
5862-8
Short code
FLUAV Ag Spec Ql IA
Synonyms
FLUAV Ag Spec Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 fragments of the influenza virus’s genetic material (RNA) using a process called polymerase chain reaction (PCR). This method is highly sensitive and can identify even small amounts of virus in your bloodstream.

How the Test Works

Blood is drawn and processed to separate serum or plasma. The viral genetic material is extracted and amplified through PCR, allowing for detection if present.

Why It’s Done

Healthcare providers may order this test if you have symptoms like fever, cough, sore throat, or fatigue that could suggest influenza, especially if you’re at higher risk for complications.

When Results May Be Positive

A positive result suggests an active influenza infection, typically occurring within days after symptoms begin. The test is most reliable during the early stages of illness.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Influenza Virus PCR (Serum/Plasma)

Frequently asked questions

What does a positive result mean?
A positive result confirms an active influenza infection. This may guide treatment decisions, such as antiviral medications, and help monitor your recovery.
What does a negative result mean?
A negative result means the test did not detect influenza virus genetic material at the time of testing. However, symptoms could still be due to other causes or may resolve before testing.
Can this test detect other viruses?
No, this test specifically looks for influenza virus genetic material. Other viral infections would require separate tests.
  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