Antibody to Flavivirus Nucleocapsid Protein (IgG) - Serum
This test measures the presence of antibodies against the nucleocapsid protein of flaviviruses, which include viruses like dengue, yellow fever, and Zika. It helps determine if your immune system has encountered these viruses in the past.
["Assesses past exposure to flaviviruses through antibody detection."]
Key facts at a glance
- LOINC
- 6634-0
- Short code
- FLUAV HK Ab Ser HAI-aCnc
- Synonyms
- FLUAV HK Ab Ser HAI-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- hai
- 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 in response to infection. The presence of these antibodies suggests prior exposure to flaviviruses, though they may not always indicate a recent or active infection.
Why It Might Be Ordered
Your healthcare provider may order this test if you have traveled to or live in an area with flavivirus risk, or if you have symptoms like fever, rash, joint pain, or neurological issues that could be linked to flavivirus infection. It can also be used for research or epidemiological studies.
Sample Collection and Preparation
A blood sample is drawn from a vein in your arm. The serum portion is separated and sent to the lab for analysis. This test is typically done on serum or plasma.
What to Expect Before the Test
No special preparation is needed for this test. You may eat and drink normally before your blood draw. If you are on blood-thinning medication, inform your healthcare provider beforehand.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Positive results indicate past exposure to flaviviruses, which can help confirm a diagnosis if symptoms are present or guide further testing. However, IgG antibodies may persist for months or years after infection, so they alone do not confirm a current infection. This test is often used alongside clinical findings and other diagnostic tools.
Short name
IgG Anti-Flavivirus Nucleocapsid
Frequently asked questions
What does a positive result mean?
Can this test differentiate between different flaviviruses?
How long do these antibodies last?
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