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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
88909-7
Short code
RSV Ag Lower resp Ql IF
Synonyms
RSV Ag Lower resp Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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?

The test detects the presence of RSV-specific IgG antibodies in your blood. These antibodies are part of your immune response and can indicate whether your body has encountered RSV before, which helps determine immunity status over time.

Why Might This Test Be Ordered?

Your healthcare provider may order this test if you have had RSV in the past, are at risk for complications from RSV, or if you need to assess long-term immunity, especially in infants, elderly individuals, or those with weakened immune systems.

When Might You Receive This Test?

This test is typically performed as a serum or plasma sample, often collected during routine blood draws. Results are usually available within a few days, depending on laboratory processing times.

What to Expect Before the Test

There are usually no special preparations needed for this test. You may have a small needle inserted into your arm to draw blood, which is a common procedure with minimal discomfort.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

High levels of RSV IgG antibodies suggest past infection and long-term immunity. Low or absent levels may indicate no prior exposure or a need for further evaluation of RSV risk. This test is particularly useful in monitoring immunity in high-risk populations or for research purposes to track RSV exposure over time.

Short name

RSV IgG Antibody

Frequently asked questions

How Long Does It Take to Get Results?
Results are typically available within 3 to 7 business days, depending on the laboratory’s workflow and any additional confirmatory testing required.
What Does a Positive or Negative Result Mean?
A positive result means you have detectable RSV IgG antibodies, indicating past exposure and immunity. A negative result means your body may not have produced these antibodies, which could mean you haven’t been exposed to RSV recently or may need further evaluation.
Can This Test Be Used to Diagnose Active RSV Infection?
No, this test specifically measures antibodies and is not used to diagnose an active RSV infection. For diagnosing current illness, other tests like viral RNA detection or antigen tests are used.
  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