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

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

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

Quick summary

["Helps determine if your immune system has been exposed to RSV or if you may have an ongoing infection."]

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

Key facts at a glance

LOINC
111045-1
Short code
RSV Ab Msmt Ser
Synonyms
RSV Ab Msmt Ser
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

Why This Test Is Done

Doctors may order this test to diagnose RSV infection, assess exposure risk (e.g., for high-risk individuals), or evaluate immune response after vaccination or prior infection. It can also help guide treatment decisions or monitor chronic conditions linked to RSV exposure.

What to Expect Before the Test

No special preparation is needed. You may have a blood draw from a vein in your arm. Tell your provider if you’re on blood-thinning medication or have a history of bleeding issues.

What the Test Results Mean

Positive results indicate the presence of RSV antibodies, suggesting past infection or exposure. Negative results mean no detectable antibodies at this time. Interpretation depends on clinical context (e.g., symptoms, vaccination history).

Common Uses

Used in pediatric care to diagnose RSV-related illnesses, in neonatal units to screen high-risk infants, and in research or surveillance programs to track RSV circulation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

RSV Antibody Test

Frequently asked questions

What does a positive result mean?
A positive result shows your body has produced antibodies to RSV, meaning you’ve likely been exposed to the virus at some point. This could mean you had an infection in the past or are currently immune. It doesn’t confirm an active infection unless combined with clinical symptoms.
Can I get this test if I’m pregnant?
Yes, this test is safe to have during pregnancy. RSV can affect newborns, so some doctors recommend testing pregnant women with high-risk factors (e.g., premature birth, chronic lung disease) to assess exposure or guide preventive measures.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times. Your provider will discuss the meaning with you based on your symptoms and medical history.
  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