Fluorescent Antibody Antibody-Specific Titration for Viral Antigen (e.g., Influenza)
This test measures the amount of specific antibodies your body produces in response to an influenza virus infection, often used to confirm recent exposure or diagnose active infection.
["Helps determine if you have an active flu infection by checking antibody levels against the virus."]
Key facts at a glance
- LOINC
- 24216-4
- Short code
- FLUAV Ab sp2 Titr Ser CF
- Synonyms
- FLUAV Ab sp2 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 detects antibodies that target specific proteins of the influenza virus. These antibodies develop after your immune system responds to the virus, either from a recent infection or vaccination. The result helps healthcare providers assess whether you have an active flu infection or have been exposed recently.
How the Test Works
A small blood sample is taken to analyze antibody levels. The sample is processed to identify the presence and concentration of antibodies that bind to the virus’s antigens. This is done using a fluorescent antibody technique, which lights up when antibodies are present.
Common Uses
Doctors may order this test if you have symptoms of the flu (e.g., fever, cough, fatigue) and recent exposure to someone with the flu, or if you’re part of a study or outbreak investigation.
What to Expect Before the Test
No special preparation is needed. You may have a small needle inserted into your arm to draw blood. The process usually takes a few minutes, and you can return to your normal activities afterward.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
High antibody levels may indicate recent infection or vaccination. Low or absent levels suggest no recent exposure or infection. This test is particularly useful in outbreaks, research, or when other diagnostic methods (like rapid flu tests) are inconclusive.
Short name
Influenza Antigen Antibody Titration
Frequently asked questions
Why might my doctor order this test?
How long does it take to get results?
Can this test be done at home?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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