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

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

This test measures the level of antibodies in your blood that your immune system produces in response to a virus. Antibodies help your body fight off infections.

Quick summary

["Helps determine if your immune system has recognized and responded to a past viral infection."]

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

Key facts at a glance

LOINC
31437-7
Short code
FLUAV IgG Ser-aCnc
Synonyms
FLUAV IgG Ser-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 Does This Test Measure?

The test detects specific antibodies (IgG) your body creates to fight a virus. IgG antibodies are a type of protein produced by your immune system after exposure to a virus, either through infection or vaccination. This test specifically looks for antibodies against viral antigens, which can indicate past infection or immunity.

Why Might You Need This Test?

Healthcare providers may order this test to check for immunity to a virus, diagnose past infections, or evaluate immune responses in certain conditions like chronic illnesses or after vaccination.

How Is the Test Performed?

A blood sample is collected from a vein in your arm. The sample is then tested using a fluorescent immunoassay method, which detects the presence and level of specific antibodies in your serum.

What Are Possible Results?

Results are qualitative (positive or negative) and indicate whether detectable levels of the specific antibodies were found. A positive result suggests your immune system has recognized the virus, while a negative result means no detectable antibodies were found.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Anti-Viral IgG Antibody Test

Frequently asked questions

How long does it take to get my test results?
Results are typically available within 24 to 48 hours, depending on your lab’s processing schedule. Follow-up with your healthcare provider for interpretation and next steps.
Can I take anything before my blood test?
No special preparations are needed, but avoid alcohol or heavy meals 24 hours before your test to ensure accurate results.
What does a positive result mean?
A positive result indicates your immune system has likely encountered the virus before, meaning you may have immunity or past infection. However, results should be interpreted by your healthcare provider in the context of your medical history and symptoms.
  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