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Fluorescent Antibody Virus Antibody, Qualitative, Serum/Plasma

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

This test detects antibodies to a specific virus in your blood, using a fluorescent antibody method. Antibodies are proteins your immune system makes in response to infection.

Quick summary

["Helps identify past exposure to a virus by detecting immune system markers."]

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

Key facts at a glance

LOINC
50693-1
Short code
FLUAV+FLUBV Ab Titr Ser CF
Synonyms
FLUAV+FLUBV Ab Titr Ser CF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
comp-fix
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 uses a fluorescent dye to detect antibodies bound to viral particles. If antibodies are present, they bind to the virus and glow under a microscope, indicating exposure. This method is highly sensitive for detecting low levels of antibodies.

How the Test Works

A small blood sample is drawn and processed to separate serum or plasma. The sample is mixed with labeled viral antigens and exposed to fluorescent light. Fluorescence indicates a positive result if antibodies are present.

Why It’s Done

This test is often used for screening or confirming past infection, especially in cases where symptoms are unclear or when monitoring immune response. It may also be part of diagnostic workup for suspected viral infections.

Common Uses

Commonly used for detecting antibodies against viruses like influenza, respiratory syncytial virus (RSV), or other pathogens where serological testing supports diagnosis or surveillance.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Virus Antibody Test (Fluorescent Antibody)

Frequently asked questions

How long will I need to wait for results?
Results are typically available within 24 to 48 hours, depending on lab processing times. Your healthcare provider will discuss the results with you during your follow-up visit.
Can I get this test at home?
No, this test requires a blood sample collected by a healthcare professional in a clinical setting. Home collection kits are not available for this specific test.
What does a positive result mean?
A positive result suggests your immune system has recognized and responded to the virus, indicating past exposure. However, it does not confirm an active infection at the time of testing.
  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