Antibody to Flavivirus Nucleocapsid Protein (IgG)
This blood test checks for antibodies that your immune system makes in response to exposure to flaviviruses, such as dengue, yellow fever, or West Nile virus. It helps determine if you’ve been previously infected or exposed to these viruses.
["This test helps diagnose past infection with flaviviruses, which can cause serious illnesses like dengue fever or encephalitis."]
Key facts at a glance
- LOINC
- 77026-3
- Short code
- FLUAV H1 RNA Nph Ql NAA+probe
- Synonyms
- FLUAV H1 RNA Nph Ql NAA+probe
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- 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 specific to the nucleocapsid protein of flaviviruses. These antibodies are produced by your immune system after an infection has cleared, often weeks to months afterward. The presence of these antibodies suggests prior exposure, but they do not indicate an active infection at the time of testing.
Why It’s Ordered
Your healthcare provider may order this test if you’ve traveled to areas where flaviviruses are common, have symptoms like fever, headache, or rash, or if you’ve been exposed to a flavivirus. It can also be used in research or outbreak investigations to track virus spread.
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into your arm to draw blood. The process usually takes a few minutes. If you’re nervous, let your provider know—they can offer ways to make it more comfortable.
What to Expect After the Test
After the blood draw, you may feel a small bruise or soreness at the site, which should go away in a day or two. Avoid vigorous activity for a few hours to prevent excessive bleeding. If you experience excessive pain, swelling, or signs of infection (like redness or fever), contact your provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Positive results indicate past exposure to flaviviruses, meaning your body has likely developed immunity. However, this test alone cannot confirm an active infection—it only shows whether you’ve been exposed before. If you’re concerned about symptoms like fever or neurological issues, discuss them with your provider, who may order additional tests.
Short name
IgG Antibody to Flavivirus Nucleocapsid
Frequently asked questions
How long does it take to get results?
Can I get this test if I’m currently sick?
Does this test replace other diagnostic tests for flavivirus infection?
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