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Respiratory Syncytial Virus (RSV) Antibody, IgG (Serum/Plasma)

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

This test measures the level of Immunoglobulin G (IgG) antibodies against respiratory syncytial virus (RSV) in your blood. IgG antibodies help your immune system recognize and fight RSV, a common virus that can cause respiratory infections.

Quick summary

["IgG antibodies indicate past exposure to RSV and long-term immune protection."]

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

Key facts at a glance

LOINC
68966-1
Short code
RSV Ag Nph Ql IA
Synonyms
RSV Ag Nph Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 Does This Test Measure?

IgG antibodies are a type of protein produced by your immune system in response to RSV infection. Once your body has encountered RSV, it produces these antibodies to help protect against future infections. This test helps determine if you have developed immunity through past infection or vaccination.

Why Might You Need This Test?

Doctors may order this test if you have had RSV in the past, have a weakened immune system, or are at higher risk for severe RSV infections. It can also help monitor immune response in certain medical conditions.

What Does a Positive Result Mean?

A positive result means your body has produced RSV IgG antibodies, suggesting you have had RSV infection at some point or have been vaccinated. This does not indicate an active infection but confirms past exposure.

What Does a Negative Result Mean?

A negative result means your body has not yet produced detectable RSV IgG antibodies, which could mean you have not been exposed to RSV recently or your immune system has not mounted an antibody response.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

RSV IgG Antibody

Frequently asked questions

Why is this test important in clinical settings?
This test is important for assessing long-term immunity to RSV, particularly in high-risk populations such as infants, elderly individuals, and those with chronic health conditions. It helps guide decisions about preventive measures like vaccination or monitoring for future infections.
How is this test performed?
A blood sample is drawn from a vein in your arm. The sample is then sent to a lab where it is tested using an immunoassay method to detect RSV-specific IgG antibodies.
How soon can I expect results?
Results are typically available within 1 to 3 business days, depending on lab processing times. Your healthcare provider will discuss the results with you during your follow-up visit.
  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