Antibody to Flavivirus, Hemagglutination Inhibition (IgG) – Serum
This test measures antibodies in your blood that may indicate past exposure to flaviviruses, such as dengue, yellow fever, or West Nile virus.
["Helps determine if you’ve had exposure to certain viruses that can cause illness."]
Key facts at a glance
- LOINC
- 101293-9
- Short code
- FLUAV H1 2009 pand RNA Thrt Ql Non-pr
- Synonyms
- FLUAV H1 2009 pand RNA Thrt Ql Non-pr
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- non-probe-amp-tar
- 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 IgG antibodies produced by your immune system in response to flaviviruses. These antibodies are a sign that your body has encountered the virus at some point, often months or years after infection. This type of antibody is typically stable and can remain in your blood for a longer duration than acute-phase antibodies.
Why It’s Done
Healthcare providers may order this test to diagnose or confirm past infection with flaviviruses, especially in travelers, individuals with symptoms of illness, or those exposed to mosquito-borne viruses in endemic regions.
Sample Collection and Preparation
A blood sample is drawn from a vein in your arm. The blood is processed to separate serum (the liquid part without blood cells), which is then tested for the presence of flavivirus-specific antibodies.
What to Expect Before the Test
No special preparation is needed. You may eat and drink normally before your blood draw. If you’re on blood-thinning medication, let your healthcare provider know.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Positive results suggest past infection with flaviviruses, which can help guide prevention strategies, monitor travel risks, or assess immune response. However, it does not indicate active infection or recent exposure. This test is particularly useful in diagnosing flavivirus infections where acute-phase tests (like PCR or viral antigen tests) are unavailable or inconclusive.
Short name
Flavivirus IgG Antibody (HAI)
Frequently asked questions
What does a positive result mean?
Can this test be used to diagnose an active infection?
How long after infection might I get a positive result?
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