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Antibody to Flavivirus Nucleocapsid Protein (IgG)

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 other related viruses.

Quick summary

["Helps identify if you’ve been exposed to flaviviruses, though not for current infection."]

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

Key facts at a glance

LOINC
105233-1
Short code
FLUAV RNA Spt Ql NAA+probe
Synonyms
FLUAV RNA Spt Ql NAA+probe
Category
chemistry
Sample
sputum
Container
Sterile sputum container
Units
N/A
Ref low
0.8
Ref high
1.2
Critical range
— – 5 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
CPT
85610
SNOMED
396252006
Specimen volume
3-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
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 exposure. This is a marker for past infection rather than an active illness.

Why It Might Be Ordered

Doctors may order this test if you’ve traveled to or lived in an area with flavivirus risk, have symptoms suggestive of a past infection (e.g., fatigue, joint pain), or if you’re investigating a possible exposure to flaviviruses.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in your arm. The sample is sent to a lab for processing and testing.

What to Expect Before the Test

No special preparation is needed. You may eat and drink normally before the test, but inform your healthcare provider about any medications you’re taking, as some can affect blood tests.

Reference range

INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A

Specimen: sputum

Inform your healthcare provider if you are taking blood thinners. No special preparation required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Anti-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, but it does not show whether you’re currently infected or if symptoms have occurred. This test is often used in research or epidemiological studies rather than routine diagnosis.
Can this test detect current infection?
No, this test only detects antibodies for past exposure. For diagnosing an active flavivirus infection, other tests like PCR or viral antigen tests are used.
How soon after exposure can I expect results?
Results may take several days to weeks to appear, as antibodies develop gradually after exposure. Your healthcare provider will discuss timing with you based on your situation.
  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