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Influenza Virus Nucleoprotein Antibody, Qualitative Immunoassay (Serum/Plasma)

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

This test detects antibodies to the influenza virus, helping identify if your immune system has recognized past exposure to the virus.

Quick summary

This test checks for immunity to influenza by detecting antibodies in your blood.

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

Key facts at a glance

LOINC
60538-6
Short code
FLUAV H1+H3+FLUBV RNA Spec Ql NAA+probe
Synonyms
FLUAV H1+H3+FLUBV RNA Spec Ql NAA+probe
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

What This Test Measures

The test uses an immunoassay method to detect specific antibodies (immunoglobulins) against the nucleoprotein of influenza viruses. These antibodies are produced by your immune system in response to past infection or vaccination. The presence of these antibodies suggests your body has been exposed to influenza, whether through infection or vaccination.

Why It Might Be Ordered

Your healthcare provider may order this test to assess immunity before vaccination, evaluate past infection (especially in high-risk groups), or monitor immune response to influenza vaccination.

How the Test Works

A small blood sample is taken from your arm. The serum or plasma is then tested in a lab using an immunoassay that detects antibody presence. The result is qualitative (positive or negative) rather than quantitative.

What to Expect Before the Test

No special preparation is needed. Wear comfortable clothing and arrive with an ID if you have any allergies or medical conditions. Bring a list of medications if you’re on them.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test helps determine if you have developed immunity to influenza through natural infection or vaccination. Positive results indicate exposure or vaccination response, while negative results suggest no detectable antibodies, which may prompt further evaluation or vaccination.

Short name

Influenza Antibody Test (Qualitative)

Frequently asked questions

Will this test show if I had the flu recently?
No, this test measures antibodies produced months after infection or vaccination, not recent illness. For acute flu symptoms, a viral test (like PCR) is needed.
What does a positive result mean?
A positive result means your immune system has likely encountered influenza before—either through infection or vaccination. It does not confirm current illness but indicates immunity.
Can I get this test at home?
Currently, this test is typically performed in a clinical lab setting. Home tests for influenza antibodies are not widely available.
  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