Fluorescent Antibody Titration for Antihuman Influenza Virus Antibodies (Serum)
This test measures the level of antibodies your body produces in response to the influenza virus. It helps determine if you’ve been exposed to the virus and whether your immune system has developed immunity.
["Assesses past exposure to influenza and immune response status."]
Key facts at a glance
- LOINC
- 47448-6
- Short code
- FLUAV H13 Ab Titr Ser
- Synonyms
- FLUAV H13 Ab Titr Ser
- 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 detects specific antibodies (immunoglobulins) that your immune system creates after exposure to the influenza virus. These antibodies are produced by your body to fight the virus and can remain in your blood for some time after infection. The test uses a fluorescent antibody technique to quantify these antibodies, allowing healthcare providers to assess immunity levels.
Why It’s Done
Doctors may order this test to evaluate whether you have developed immunity to influenza after vaccination or natural infection. It can also be used in research or outbreak investigations to track the spread of influenza in a community.
Sample Collection and Preparation
A blood sample is drawn from a vein in your arm. The serum portion of the blood is separated and sent to the lab for testing. The lab uses a specialized immunoassay method to detect and measure the antibody levels against influenza.
What to Expect Before the Test
There are no special preparations needed for this test. You may have a slight bruise or discomfort at the injection site, but this usually fades quickly. Avoid eating or drinking for a short time before the blood draw if instructed by your provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is primarily useful for determining immunity status to influenza. High antibody titers may indicate recent or past infection, while lower levels could suggest insufficient immunity, especially after vaccination. It is not a diagnostic tool for active influenza infection but can guide vaccination decisions or monitor immune response in high-risk populations.
Short name
Influenza Antibody Titer (Serum)
Frequently asked questions
How long does it take to get results from this test?
Can this test be used to diagnose active influenza?
What does a positive or negative result mean?
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