Skip to content

Fluorescent Immunoassay for Anti-Viral Immunoglobulin G (IgG) Antibodies Against Influenza Virus

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

This test measures the level of antibodies your body produces in response to exposure to the influenza virus. It helps determine if you’ve been infected or vaccinated.

Quick summary

["This test checks for immunity to flu by detecting antibodies your immune system makes after exposure or vaccination."]

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

Key facts at a glance

LOINC
49073-0
Short code
FLUAV IgG CSF-mCnc
Synonyms
FLUAV IgG CSF-mCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What This Test Measures

The test uses a fluorescent immunoassay to detect IgG antibodies specific to influenza viruses. These antibodies are part of your immune response and can indicate past infection or vaccination effectiveness.

Why It’s Done

Doctors may order this test to assess immunity in people at high risk of flu complications, evaluate vaccine response, or investigate unexplained flu-like symptoms in certain contexts.

How the Test Works

A small blood sample is taken and analyzed to detect IgG antibodies that bind to influenza antigens. Fluorescence signals indicate antibody presence, helping identify immune response status.

Sample Collection and Preparation

Blood is drawn from a vein, typically in your arm. The sample is processed and tested for IgG antibodies against influenza without further preparation needed by you.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgG Anti-Influenza Antibody (FIA)

Frequently asked questions

This test is primarily used to confirm past exposure to influenza or assess vaccine-induced immunity, especially in high-risk populations like elderly individuals or those with chronic illnesses.
If your test result is positive, it means your body has developed antibodies against the influenza virus, likely from prior infection or vaccination. A negative result suggests no detectable antibodies, which may mean you haven’t been exposed or vaccinated recently.
What does a positive result mean?
A positive result indicates your immune system has recognized and produced antibodies against the influenza virus, which could mean you’ve had the flu or received a flu vaccine. This does not guarantee immunity against all flu strains but confirms exposure or vaccination response.
How long after exposure or vaccination should I wait for accurate results?
Results may take 24 to 72 hours to process. For accurate interpretation, especially after vaccination, wait at least 2–4 weeks before testing, as antibodies develop gradually after immunization.
  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