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Influenza Virus Nucleoprotein Antibody (IgG) in Serum or Plasma by Immunoassay

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

This test measures antibodies your immune system produces in response to the influenza virus, helping detect past infection.

Quick summary

["Assists in confirming past flu exposure or assessing immunity over time."]

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

Key facts at a glance

LOINC
105214-1
Short code
FLUAV+FLUBV RNA Bronch Ql NAA+probe
Synonyms
FLUAV+FLUBV RNA Bronch 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 detects IgG antibodies specific to the influenza virus nucleoprotein. These antibodies develop after your body has encountered the virus, often weeks after infection. They remain in your system long-term and can indicate immunity.

Why It Might Be Ordered

Your healthcare provider may order this test if you have symptoms of flu, if you’ve been exposed to influenza, or if you’re evaluating long-term immunity after vaccination or prior infection.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The blood is processed to separate serum or plasma, which is then tested for IgG antibodies using an immunoassay method.

What to Expect Before the Test

No special preparation is needed. You may have a slight bruise or discomfort at the injection site, but this usually fades quickly. Avoid alcohol before the test if it affects your blood clotting.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Influenza IgG Antibody

Frequently asked questions

How long does it take to get results?
Results are typically available within 24 to 48 hours after the test is performed.
Can this test be used to diagnose active flu?
No, this test measures antibodies from past infection and does not diagnose active flu. For current infection, other tests like rapid flu tests or viral PCR may be needed.
What does a low or negative result mean?
A negative result means no detectable IgG antibodies were found, which could indicate you’ve never been exposed to the influenza virus or that your immune response hasn’t developed yet.
  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