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Respiratory Syncytial Virus (RSV) Antibody

Published: July 27, 2026Updated: August 25, 2026

This biomarker measures the level of antibodies against RSV in the blood, indicating current or past infection.

Quick summary

RSV antibody levels help diagnose current or past RSV infections.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
index
Clinical utility
diagnostic
Result kind
qualitative
FDA-cleared
Roche RSV, Abbott RSV, Siemens RSV
interpretation: {"text":"Indicates no current or past exposure to RSV, or insufficient antibody response.","label":"Low Index (0-0.4)"}; {"text":"Suggests recent or past infection with RSV, or a strong immune response.","label":"High Index (0.6-1)"}

Respiratory Syncytial Virus (RSV) is a common respiratory virus that can cause severe illness, especially in infants and older adults. RSV antibody testing is used to detect the presence of antibodies that the body produces in response to RSV infection.

The test measures the index of RSV antibodies in the blood, with a reference range typically between 0 and 1. A higher index may indicate a recent or past infection, while a lower index suggests no current or prior exposure.

This diagnostic tool is particularly useful in identifying RSV infections in patients with respiratory symptoms and in epidemiological studies to understand the prevalence of RSV in a population.

Frequently asked questions

How is the RSV antibody test performed?
The test is performed using a blood sample, which is analyzed in a laboratory to measure the levels of RSV antibodies.
What does a positive RSV antibody test mean?
A positive test indicates the presence of RSV antibodies, suggesting current or past infection with the virus.
  1. 1
    Respiratory Syncytial Virus (RSV) - CDCSource
  2. 2
    RSV Antibody Testing - Mayo ClinicSource

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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 25, 2026. · Read our editorial policy