: Influenza A Virus Hemagglutinin Type 8 Antibody Titer, Serum
: This test measures the level of antibodies in a serum sample that react with the hemagglutinin type 8 protein of influenza A virus, which can help show whether a person has been exposed to or vaccinated against that specific influenza A strain.
[": The test uses a serum sample to detect and quantify antibodies against a specific influenza A hemagglutinin subtype."]
Key facts at a glance
- LOINC
- 47457-7
- Short code
- FLUAV H8 Ab Titr Ser
- Synonyms
- FLUAV H8 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 assay looks for antibodies in the blood that bind to the hemagglutinin 8 (H8) surface protein of influenza A virus. The "titer" refers to how much the sample can be diluted and still show antibody activity, giving a sense of antibody level.
: Why a Doctor Might Order It
: This is a specialized test, usually done in research or public-health surveillance settings rather than routine care. It may be used to study exposure to or immune response against particular influenza A subtypes, such as in vaccine or outbreak investigations.
: How the Sample Is Collected
: A blood sample is drawn from a vein, typically in the arm, and the serum (the clear liquid part) is separated for testing. No special preparation is usually needed unless your care team gives specific instructions.
: What the Results Can and Cannot Tell You
: Because this is a targeted antibody test, results are interpreted against the specific virus subtype and the testing method used. A result on its own does not diagnose current infection and should be read alongside clinical history and other tests; your care team will explain what the findings mean for you.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
: Antibody titers against influenza hemagglutinin proteins are used mainly to assess prior exposure or immune response to a given influenza A subtype. Interpretation depends on the specific assay, the subtype tested, and the person's vaccination and infection history, so results are not generalizable to all influenza strains and are not a stand-alone diagnosis.
Short name
: FluA H8 Antibody Titer
Frequently asked questions
: Is this a routine flu test?
: Does a high titer mean I currently have the flu?
: Do I need to fast before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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