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Respiratory Syncytial Virus Antibody, Titration (IgG)

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

This test measures the amount of antibodies your body produces in response to the respiratory syncytial virus (RSV), a common virus that can cause respiratory infections.

Quick summary

["Knowing your RSV antibody levels helps doctors assess past exposure and potential immunity."]

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

Key facts at a glance

LOINC
33382-3
Short code
RSV Ab Titr CSF
Synonyms
RSV Ab Titr CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What Does This Test Measure?

The test detects IgG antibodies specific to RSV, which develop after your body has been exposed to the virus. These antibodies provide long-term immunity. The result helps determine if you’ve had RSV in the past or if your immune system is likely to respond to future exposures.

Why Might You Need This Test?

Doctors may order this test if you have a history of RSV infections, are at higher risk for severe illness (e.g., infants, elderly, or those with weakened immune systems), or if you’re considering vaccination against RSV.

What to Expect Before the Test

No special preparation is needed. A blood sample will be drawn from a vein in your arm. The test is typically done in a lab and results are available within a few days.

What Are the Results Meaning?

Results are qualitative (positive/negative) rather than quantitative, indicating whether detectable RSV-specific IgG antibodies are present. A positive result suggests past exposure, while a negative result means no detectable antibodies.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

High IgG levels indicate past RSV infection, which may offer protection against future infections. However, antibody levels do not guarantee immunity in everyone and may decline over time. This test is often used to guide vaccination decisions or monitor immune status in high-risk populations.

Short name

RSV IgG Antibody Level

Frequently asked questions

How long does it take to get results from this test?
Results are usually available within 3 to 5 business days after the blood sample is processed.
Can RSV antibody levels change over time?
Yes, RSV antibody levels can decrease over months or years after infection. They may not remain high indefinitely, so periodic testing may be needed to assess immunity.
Is this test the same as a rapid RSV test for infections?
No, this test measures antibodies (IgG) from past exposure, while rapid tests detect active RSV infection through viral presence in nasal or throat swabs.
  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