Skip to content

Antibody Titration to Anti-Flu Virus (Influenza Hemagglutinin Inhibitor)

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

This test measures your immune response to previous exposure to the flu virus by detecting antibodies that bind to its surface proteins. It helps determine if your body has developed immunity.

Quick summary

["Assesses whether your immune system has recognized and responded to flu exposure over time."]

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

Key facts at a glance

LOINC
47455-1
Short code
FLUAV H6 Ab Titr Ser
Synonyms
FLUAV H6 Ab Titr 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 This Test Measures

The test looks for specific antibodies (IgG and/or IgM) that target the hemagglutinin protein of influenza viruses. These antibodies are produced by your immune system after infection or vaccination. The result is expressed as a ratio or concentration, indicating relative exposure or immunity level.

Why It’s Done

Doctors may order this test if you’ve had recent flu symptoms, received a flu vaccine, or if you’re being monitored for immunity after exposure. It can also help evaluate long-term immunity in high-risk groups.

Sample Collection and Preparation

A blood sample is taken from a vein in your arm. The serum or plasma is then analyzed to measure antibody levels using an immunoassay method, which detects the presence and concentration of flu-specific antibodies.

Interpreting Results

Results are typically reported as a ratio (e.g., 1:40, 1:160) or a concentration value. A higher ratio or concentration suggests stronger immunity, while lower values may indicate no detectable response or recent exposure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Influenza Antibody Screening/Titration

Frequently asked questions

This test is not a diagnostic tool for active flu infection but helps assess past exposure or immunity status. It’s useful for determining vaccine efficacy, monitoring immune response in vaccinated individuals, or guiding decisions for high-risk patients.
This test does not replace regular flu monitoring or annual vaccinations. Results should be discussed with your healthcare provider to tailor your care plan.
What does a positive result mean?
A positive result indicates your immune system has produced antibodies against the flu virus, suggesting prior exposure (natural infection) or vaccination. However, this does not guarantee protection against future infections.
How long does it take to get results?
Results are usually available within 1–3 business days, depending on lab processing times. Your healthcare provider will contact you with the final report.
  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