Fluorescent antibody test for anti-flu virus antibodies (serum/plasma)
This test detects antibodies your immune system produces in response to the flu virus. It helps determine if you’ve been exposed to flu strains like Influenza A or B.
["Checks for past flu infection by measuring immune response."]
Key facts at a glance
- LOINC
- 61102-0
- Short code
- FLUAV + FLUBV Ag Spec IF
- Synonyms
- FLUAV + FLUBV Ag Spec IF
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- if
- 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 looks for specific antibodies (immunoglobulins) in your blood that target flu viruses. These antibodies develop after your body has encountered the virus, either through infection or vaccination. The presence of these antibodies suggests your immune system has recognized and responded to the flu virus.
Why It’s Performed
Doctors may order this test if you’ve had recent flu symptoms, if you’re at higher risk for complications (like older adults or those with chronic illnesses), or if you’re unsure about your vaccination status. It can also help confirm exposure in outbreaks or during outbreaks.
Sample Collection and Preparation
A blood sample is drawn from a vein, usually in your arm. The sample is processed to separate serum or plasma, which is then tested for antibody presence. This test is typically done on the same day as blood collection.
What to Expect Before the Test
No special preparation is needed. You may want to avoid alcohol before the test, as it can affect blood test results. Wear comfortable clothing and bring a photo ID if required by your healthcare provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Positive results indicate your immune system has recognized flu viruses, either through past infection or vaccination. This can help guide treatment decisions, such as whether you need antiviral medications or if you’ve built immunity. Negative results mean no detectable antibodies were found, suggesting either no prior exposure or recent infection that hasn’t yet triggered an antibody response.
Short name
Anti-Fluab Antibody Test
Frequently asked questions
How long does it take to get results?
Can this test be used to diagnose the flu?
Is this test covered by insurance?
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