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Fluorescent Immunoassay for Antibodies to Flavivirus Nucleocapsid Protein (IgG)

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

This test measures 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 viruses that can cause illness."]

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

Key facts at a glance

LOINC
44557-7
Short code
FLUAV Ab Fld Ql
Synonyms
FLUAV Ab Fld Ql
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 This Test Measures

The test detects IgG antibodies specific to the nucleocapsid protein of flaviviruses. These antibodies are produced by your immune system after exposure to the virus, often months after infection. This test is used to identify past infection rather than active illness.

Why It Might Be Ordered

Your healthcare provider may order this test if you have traveled to areas with flavivirus risk, 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.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The sample is processed to separate serum or plasma, which is then tested for antibodies using a fluorescent immunoassay method.

What to Expect Before the Test

No special preparation is needed. You may eat and drink normally, but inform your provider if you’re on blood-thinning medication or have bleeding disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Flavivirus IgG Antibody (Nucleocapsid)

Frequently asked questions

Will this test show if I currently have a flavivirus infection?
No, this test measures antibodies from past exposure, not active infection. If you suspect an acute infection, your provider may order additional tests or clinical evaluation.
Can I get this test at home?
No, this test requires a blood sample collected by a healthcare professional in a clinical setting. Some labs may offer at-home blood draws, but results must be interpreted by a doctor.
Does this test differentiate between dengue, yellow fever, or Zika?
This test detects antibodies to flaviviruses broadly, so it cannot specifically identify which virus caused your exposure. Additional tests may be needed for precise diagnosis.
  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