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Respiratory Syncytial Virus (RSV) Antibody, Serum (Qualitative Immunoassay)

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

This test checks for antibodies to the respiratory syncytial virus (RSV) in your blood. Antibodies are your body’s way of recognizing and fighting infections.

Quick summary

["This test helps determine if your immune system has encountered RSV before."]

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

Key facts at a glance

LOINC
31950-9
Short code
RSV Ag Spec Ql
Synonyms
RSV Ag Spec Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 specific antibodies produced by your immune system in response to RSV exposure. These antibodies indicate past infection or immunity, though they don’t confirm active illness.

Why Might You Need This Test?

Doctors may order this test to evaluate immune response in high-risk groups (e.g., infants, elderly, or immunocompromised individuals) or to assess exposure history in outbreaks.

Sample Collection and Preparation

A blood sample is drawn from your arm. The serum (liquid part of blood after clotting) is then tested using an immunoassay method to detect RSV antibodies.

When Might You Get Results Back?

Results are typically available within 24 to 48 hours, depending on lab processing times. A positive result suggests prior exposure, but it doesn’t confirm current infection.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

A positive result means your body has developed antibodies to RSV, indicating past infection or vaccination. This can inform preventive strategies (e.g., vaccination recommendations for high-risk groups). A negative result means no detectable antibodies were found at the time of testing, but this doesn’t rule out past exposure if testing was done too early.

Short name

RSV Antibody Test

Frequently asked questions

How long do RSV antibodies last?
RSV antibodies typically remain in your system for months to years after infection, but their exact duration varies. Some people may develop long-term immunity, while others may not.
Can this test be used to diagnose an active RSV infection?
No, this test only detects past exposure or immunity. For diagnosing an active RSV infection, your doctor may recommend other tests like viral testing or monitoring symptoms.
Is there any preparation needed before this test?
No special preparation is needed. You can eat, drink, or take medications as usual on the day of your test.
  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