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Respiratory Syncytial Virus (RSV) Antibody, Immunoassay (Qualitative or Quantitative)

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

This test detects antibodies to respiratory syncytial virus (RSV), a common virus that can cause respiratory infections in infants, children, and older adults.

Quick summary

["Helps identify past or current RSV exposure, guiding treatment and preventive measures."]

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

Key facts at a glance

LOINC
77390-3
Short code
RSV Ag Nph Ql IF
Synonyms
RSV Ag Nph 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 measures the presence of antibodies against RSV, which your immune system produces in response to infection. Antibodies can indicate whether you’ve been exposed to RSV at some point, even if you didn’t get sick or if symptoms were mild.

Why Might You Need This Test?

Doctors may order this test if you have symptoms of a respiratory infection (like coughing, wheezing, or difficulty breathing) and suspect RSV, especially if you’re a high-risk group (e.g., infants, elderly, or those with weakened immune systems). It can also be used to monitor RSV exposure in certain settings like hospitals or long-term care facilities.

Sample Collection and Preparation

A blood sample is typically taken from a vein in your arm. The sample is processed to separate serum or plasma, which is then tested for RSV antibodies using an immunoassay method. This test does not require fasting.

When Might You Get Results?

Results may take a few days to a week, depending on lab processing times. Your healthcare provider will discuss the results with you and explain what they mean in the context of your health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

RSV Antibody Test

Frequently asked questions

When could I expect this test to be ordered?
This test is often ordered during flu season or when RSV outbreaks are reported in your community, particularly if you or someone you care for is at higher risk of severe illness.
What does a positive result mean?
A positive result means your body has produced antibodies against RSV, indicating past exposure. It doesn’t necessarily mean you’re currently infected, but it may help guide prevention efforts or further testing if needed.
Can this test be used to diagnose active RSV infection?
No, this test alone cannot diagnose an active RSV infection. It only shows whether you’ve been exposed to RSV at some point. Symptoms and clinical evaluation are required for a diagnosis of current infection.
  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