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Antibody to Flavivirus, Hemagglutination Inhibition (IgG) - Serum

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

This blood test checks for antibodies to flaviviruses, which include viruses like dengue, yellow fever, and West Nile. It helps determine if your body has ever been exposed to these viruses.

Quick summary

["This test helps assess past infection with flaviviruses, aiding in diagnosis and monitoring."]

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

Key facts at a glance

LOINC
50701-2
Short code
FLUAV H1 Ag Islt Ql IF
Synonyms
FLUAV H1 Ag Islt Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 in your serum. IgG antibodies are a type of immune protein produced by your body in response to infection. If you have had exposure to a flavivirus, your immune system will produce these antibodies, which can be detected in this test.

How the Test Works

A small blood sample is taken from your arm. The serum portion of the blood is then analyzed to measure the presence and level of IgG antibodies against flaviviruses using a hemagglutination inhibition assay. This method helps identify whether your immune system has recognized and responded to these viruses.

Why It’s Done

Doctors may order this test if you have symptoms like fever, headache, joint pain, or rash that could be consistent with flavivirus infection. It may also be used in travelers to high-risk areas, individuals with known exposure, or those with chronic conditions like kidney disease or immune disorders.

What to Expect Before the Test

No special preparation is needed. You may have a small bandage on your arm after the blood draw. If you are on blood-thinning medication, let your healthcare 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 (HAI)

Frequently asked questions

How long does it take to get the results?
Test results are typically available within 1 to 3 business days, depending on your lab’s processing schedule. Follow-up with your healthcare provider to discuss the results and next steps.
What does a positive result mean?
A positive result suggests your body has produced antibodies against flaviviruses, indicating past exposure. This may mean you had an infection, but it does not confirm the specific virus or recent infection. Your doctor may recommend additional testing if needed.
Can I get this test if I’m pregnant?
Yes, this test can be performed during pregnancy if medically necessary. However, always discuss the potential benefits and risks with your healthcare provider before the test.
  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