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Fluorescent Immunoassay for Antibodies to Flavivirus Nucleocapsid Protein (IgG)

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

This test checks for antibodies to a core protein found in certain viruses, like dengue or Zika, which may indicate past infection.

Quick summary

Helps determine if you’ve had exposure to flaviviruses in the past.

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

Key facts at a glance

LOINC
110977-6
Short code
FLUAV+FLUBV Ab Msmt Ser
Synonyms
FLUAV+FLUBV Ab Msmt Ser
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Does This Test Measure?

The test detects antibodies (IgG) against the nucleocapsid protein of flaviviruses. These antibodies are produced by your immune system after exposure to the virus, often months after infection. This method uses fluorescence to identify these antibodies in your blood sample.

Why Might You Need This Test?

Your healthcare provider may recommend this test if you’ve traveled to areas where flaviviruses are common, have symptoms like fever, rash, or joint pain, or if you’ve been exposed to a flavivirus. It can also be used to monitor past infections or assess immune response.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The sample is processed to separate serum (liquid part of blood) for testing. This test does not require fasting or special preparation.

What Are Common Symptoms?

Flavivirus infections can cause flu-like symptoms such as fever, headache, body aches, nausea, vomiting, and rash. Some infections, like dengue, can lead to more severe complications, including organ failure. Symptoms may appear 2–14 days after exposure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Flavivirus IgG Antibody Test

Frequently asked questions

How Long Does It Take to Get Results?
Results are typically available within 1–3 business days, depending on lab processing times. Your healthcare provider will discuss the results with you during your follow-up visit.
Can This Test Be Used for Active Infection?
No, this test only detects antibodies for past exposure. For diagnosing an active infection, other tests (like PCR or viral antigen tests) may be needed.
What If My Test Is Positive?
A positive result suggests you likely had a flavivirus infection in the past. Your provider may recommend further testing or monitoring based on your symptoms, travel history, or exposure risk. Follow-up care depends on your clinical needs.
  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