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Fluorescent Antibody Assay for Avian Influenza Virus (H5N1) Antibodies in Serum

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

This test detects antibodies to the H5N1 strain of avian influenza virus in your blood serum. Antibodies indicate your immune system’s response to exposure, whether past or potential.

Quick summary

["Checks for immunity or exposure to H5N1 avian influenza virus through antibody detection."]

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

Key facts at a glance

LOINC
47443-7
Short code
FLUAV Ab Egg Yolk Ql
Synonyms
FLUAV Ab Egg Yolk Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 immunoassay (fia) method to identify specific antibodies produced by your immune system in response to H5N1 avian influenza. These antibodies are a sign that your body has encountered the virus, either through infection or vaccination.

Why It’s Done

Healthcare providers may order this test to assess exposure risk, monitor potential infection in high-risk groups (e.g., poultry workers, travelers to affected regions), or evaluate immune response after vaccination.

Sample Collection and Preparation

Blood is drawn from a vein, and serum is separated for testing. The serum is then analyzed in a lab using fluorescence to detect antibody presence.

Interpretation and Results

Results are qualitative (positive/negative) rather than quantitative, meaning they indicate whether antibodies were detected but not their exact level. A positive result suggests past exposure or immunity.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Avian Flu Antibody Test (Serum)

Frequently asked questions

What does a positive result mean?
A positive result means your immune system has likely encountered H5N1 avian influenza before, either through infection or vaccination. This does not mean you are currently sick but could indicate past exposure.
Can this test detect current infection?
No, this test only detects antibodies, which appear after infection or vaccination, not during an active illness. For current infection, other tests or symptoms would be needed.
Is this test covered by insurance?
Coverage depends on your insurance plan and clinical indication. Always check with your provider or insurance company before scheduling the test.
  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