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Fluorescent Immunoassay for Anti-Vaccinia Virus Antibodies (Serum/Plasma)

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

This test detects antibodies to the vaccinia virus, which is used in vaccines like smallpox vaccine. It helps assess immune response after exposure or vaccination.

Quick summary

["Checks if your body has developed immunity to vaccinia virus after exposure or vaccination."]

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

Key facts at a glance

LOINC
49529-1
Short code
FLUAV Ag Islt Ql IF
Synonyms
FLUAV Ag Islt Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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

Your healthcare provider may order this test if you’ve had recent exposure to vaccinia virus (e.g., from a smallpox vaccine) or if you’re investigating potential infection. It’s also used in research or clinical trials involving live vaccines.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample (usually from your arm) in a serum or plasma tube. The test is quick and typically done in a lab setting.

How the Test Works

The test uses a fluorescent immunoassay to detect specific antibodies in your blood that target the vaccinia virus. If antibodies are present, they bind to virus particles, and a fluorescent marker signals their presence.

What the Results Mean

Results are qualitative (positive or negative) and indicate whether 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.

Clinical Significance

Short name

Anti-Vaccinia Virus Antibody Test

Frequently asked questions

What does a positive result mean?
A positive result means your body has produced antibodies against the vaccinia virus, which may indicate prior exposure (e.g., vaccination) or infection. This can help confirm immunity or guide further medical decisions.
What does a negative result mean?
A negative result means no detectable antibodies were found, which could mean you haven’t been exposed to the virus recently or your immune system hasn’t yet produced antibodies. Follow-up testing or vaccination may be recommended.
How long do results take?
Results are typically available within 1–3 business days, depending on lab processing times. Your healthcare provider will discuss the results with you.
  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