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Serum or Plasma Immunoassay for Anti-Viral Antibodies (e.g., Influenza Virus IgG)

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

This test measures your immune system’s response to previous exposure to the influenza virus by detecting specific antibodies in your blood.

Quick summary

["Checks if your body has made antibodies against flu viruses, often used to assess past infection or immunity."]

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

Key facts at a glance

LOINC
49075-5
Short code
FLUAV IgM CSF-mCnc
Synonyms
FLUAV IgM CSF-mCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What This Test Measures

The test looks for immunoglobulin G (IgG) antibodies, which your immune system produces after recovering from an influenza infection or after vaccination. These antibodies indicate long-term immunity and can help determine if you’ve been exposed to the flu virus in the past.

Why It’s Ordered

Doctors may order this test to evaluate immunity in people at high risk of complications from the flu, such as elderly adults, young children, or those with chronic health conditions. It can also be used in research or outbreak investigations to track viral spread.

Sample Collection and Preparation

A blood sample is drawn from your arm, and the serum or plasma is separated for testing. The sample is then analyzed using an immunoassay method to detect the presence of specific antibodies.

What to Expect Before the Test

No special preparation is needed, but you may want to avoid alcohol or certain medications that could affect blood tests a few days before your appointment. Wear comfortable clothing if you prefer.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Influenza Antibody Test

Frequently asked questions

Will this test show if I currently have the flu?
No, this test only detects antibodies from past exposure or immunity, not active flu infection. If you suspect you have the flu, see your healthcare provider for other diagnostic tests.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Your doctor will discuss the findings with you during your follow-up visit.
Can I get this test if I’m pregnant?
Yes, this test is generally safe during pregnancy and can be ordered if needed. Always discuss any tests with your healthcare provider to ensure it’s appropriate for your situation.
  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