Anti-Influenza Virus Antibody Screening (Serum/Plasma)
This test checks for antibodies in your blood that your immune system produces in response to exposure to the influenza virus. It helps determine if you’ve been infected or vaccinated.
["Detects past or current exposure to flu virus through immune response."]
Key facts at a glance
- LOINC
- 44556-9
- Short code
- FLUAV Ab Ser Ql CF
- Synonyms
- FLUAV Ab Ser Ql 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 measures the presence of antibodies (specifically immunoglobulin G, or IgG) that your body creates after encountering the influenza virus. These antibodies indicate a past infection or vaccination response. Some tests may also check for IgM antibodies, which appear shortly after infection but typically decline over time.
Why It’s Ordered
Your healthcare provider may order this test if you have symptoms of the flu, have been exposed to someone with the flu, or if you’re planning travel to regions with higher flu activity. It can also help assess immunity after vaccination.
Sample Collection and Preparation
A blood sample is taken from a vein in your arm. The blood is processed to separate serum or plasma, which is then analyzed for antibody levels. This test does not require fasting or special preparation.
How the Results Are Interpreted
Results are qualitative (positive or negative) and indicate whether antibodies were detected. A positive result suggests exposure to the influenza virus, but it does not confirm the current infection status or the exact type of flu virus involved.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Influenza Antibody Screen
Frequently asked questions
A positive test result may prompt further testing to identify the specific flu strain or rule out other illnesses with similar symptoms. It can also guide decisions about vaccination or antiviral treatment if needed.
How long do I need to wait before retesting if I suspect I have the flu?
Can this test detect all types of influenza viruses?
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