Skip to content

Antibody to Flavivirus Nucleocapsid (IgG) - Serum

Published: August 9, 2026Updated: August 16, 2026

This test detects antibodies in your blood that may indicate past exposure to flaviviruses, such as dengue, yellow fever, or Zika viruses.

Quick summary

["Helps determine if you’ve had exposure to certain viral infections that can’t be detected by other tests."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
85534-6
Short code
FLUAV avian NUC Ab Ser IA
Synonyms
FLUAV avian NUC Ab Ser IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 IgG antibodies specific to the nucleocapsid protein of flaviviruses. These antibodies develop after your immune system has encountered the virus, usually weeks to months after infection. This is a marker for past infection rather than an active illness.

Why It’s Ordered

Your healthcare provider may order this test if you’ve traveled to areas where flaviviruses are common, have symptoms suggestive of a viral illness (like fever, headache, or rash), or if you’re being evaluated for conditions linked to flavivirus exposure, such as Guillain-Barré syndrome or chronic fatigue.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The serum portion of your blood is used for this test. You may feel slight discomfort during the draw, but it usually doesn’t cause lasting pain.

What to Expect Before the Test

No special preparation is needed. You can eat, drink, or take medications as usual. If you’re on blood thinners or have a history of bleeding disorders, let your provider know before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Antibody to Flavivirus Nucleocapsid

Frequently asked questions

What does a positive result mean?
A positive result indicates your immune system has likely encountered a flavivirus in the past, meaning you may have been infected. This does not mean you are currently sick, but it can help guide further medical evaluation or preventative measures.
Can this test detect active infection?
No, this test specifically looks for IgG antibodies, which develop after an infection has resolved. For active infection, other tests (such as IgM antibodies or viral RNA testing) would be needed.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing schedule. Your healthcare provider will discuss the results with you during your follow-up visit.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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