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Antibody to Flavivirus (e.g., Dengue, Yellow Fever) IgG

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

This test measures the presence of antibodies in your blood that your immune system makes in response to exposure to certain viruses, such as dengue or yellow fever.

Quick summary

["Helps determine if you’ve had past exposure to flaviviruses."]

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

Key facts at a glance

LOINC
85805-0
Short code
FLUAV H7 Ag Titr Islt HAI
Synonyms
FLUAV H7 Ag Titr Islt HAI
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 flaviviruses, which your body produces after an infection has cleared. These antibodies remain in your blood for years, helping your immune system recognize and fight off the virus if you’re exposed again.

Why It’s Ordered

Doctors may order this test if you’ve traveled to areas with flavivirus outbreaks, have symptoms like fever, headache, or rash, or if you’re at higher risk (e.g., healthcare workers, travelers). It can also help diagnose or confirm flavivirus infections in people with unclear symptoms.

How the Test Works

A blood sample is taken, and the test uses an immunoassay (often a clia or fia method) to identify flavivirus-specific IgG antibodies. The result tells you whether your immune system has encountered these viruses before.

Sample Collection

A small needle is used to draw blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The blood is then sent to a lab for testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Positive results indicate past exposure to flaviviruses, which can help guide prevention strategies (e.g., vaccination if applicable) or rule out active infection when other tests are inconclusive. Negative results mean your body hasn’t produced these antibodies yet or you’ve never been exposed.

Short name

IgG Antibody to Flavivirus

Frequently asked questions

What does a positive result mean?
A positive result suggests you’ve likely had a flavivirus infection in the past, but it doesn’t prove you’re currently infected. It’s important to discuss your symptoms and travel history with your doctor to understand next steps.
Can this test detect active flavivirus infection?
No, this test only detects IgG antibodies, which appear after the infection has resolved. For active infection, you’d need additional tests like viral RNA detection or IgM antibody testing.
How long do flavivirus IgG antibodies last?
IgG antibodies can persist for years after infection, sometimes even decades. However, their levels may gradually decline over time, so repeated testing isn’t typically recommended unless you have specific concerns or symptoms.
  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