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

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

This test checks for antibodies in your blood that your immune system produces in response to a specific virus. Antibodies like IgG can indicate past infection or immunity.

Quick summary

["This test helps determine if you’ve been exposed to a virus and your body has mounted an immune response."]

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

Key facts at a glance

LOINC
57324-6
Short code
FLUAV IgG sp1 Ser IA-aCnc
Synonyms
FLUAV IgG sp1 Ser IA-aCnc
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
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 This Test Measures

The test detects IgG antibodies, a type of protein your immune system makes to fight off infections. These antibodies can stay in your blood for years after exposure, helping your body remember the virus for future protection. The method used is a fluorescent immunoassay, which identifies these antibodies with high sensitivity.

Why It’s Done

Doctors may order this test to diagnose past infection, evaluate immunity, or confirm exposure to certain viruses. It’s often used in screening or follow-up for conditions like chronic viral infections or vaccine responses.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The serum (liquid part of blood after clotting) is then tested for IgG antibodies using a lab technique that detects fluorescent signals when antibodies bind to virus markers.

What to Expect Before the Test

No special preparation is needed, but inform your doctor about any medications or recent illnesses that could affect results. Avoid alcohol before the draw if your doctor advises it.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Antibody to Virus (Screen)

Frequently asked questions

Will this test show if I currently have an active infection?
This test primarily detects past exposure or immunity through IgG antibodies. It may not show active infection unless combined with other tests or clinical symptoms. Active infection is typically diagnosed through viral detection tests or symptom evaluation.
Can I get false results from this test?
False results are rare but possible due to cross-reactions with other viruses, recent vaccination, or immune conditions. Your doctor will interpret results in the context of your medical history and symptoms.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times. Follow-up with your healthcare provider to discuss findings and next steps.
  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