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Antibody Response to Influenza Virus (Qualitative Immunoassay)

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

This test checks if your body has developed antibodies against the influenza virus, which can help determine if you’ve been exposed to the virus or vaccinated.

Quick summary

["Assesses immune response to flu infection or vaccination."]

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

Key facts at a glance

LOINC
81305-5
Short code
FLUAV H1 2009 pan RNA Ct Resp Qn NAA+pr
Synonyms
FLUAV H1 2009 pan RNA Ct Resp Qn NAA+pr
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms of the flu, have been exposed to someone with the flu, or if you’re unsure whether you’ve had the flu virus before. It can also be used to monitor immune response after vaccination.

What to Expect Before the Test

No special preparation is needed. You may have a small blood sample drawn from a vein in your arm. If you’re unsure, ask your provider about any restrictions, such as fasting.

What the Test Results Mean

Positive results indicate the presence of antibodies, suggesting past infection or vaccination. Negative results mean no detectable antibodies, which could mean you haven’t been exposed or vaccinated recently.

Common Reasons for Testing

This test is often used to confirm flu exposure, evaluate vaccine effectiveness, or assess immune response in certain clinical settings.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test helps diagnose past flu exposure or assess immune response but is not a direct measure of current infection. It’s useful for epidemiologic studies, vaccine monitoring, or evaluating immune status in high-risk populations.

Short name

Influenza Antibody Test

Frequently asked questions

What does a positive result mean?
A positive result means your body has produced antibodies against the influenza virus, likely due to prior infection or vaccination. This does not confirm a current illness but indicates immunity.
Can this test detect the flu virus itself?
No, this test does not detect the live flu virus. It only measures antibodies produced by your immune system in response to the virus.
How often should I get this test?
The frequency depends on your clinical needs. Your healthcare provider will determine if and when to repeat the test, such as after vaccination or if symptoms suggest recent exposure.
  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