Serum or plasma concentration of Respiratory Syncytial Virus (RSV) antibodies (IgG)
This test measures the amount of antibodies your body produces in response to the respiratory syncytial virus (RSV), a common cause of respiratory infections in children and older adults.
["Assessing RSV immunity helps guide vaccination or infection prevention strategies."]
Key facts at a glance
- LOINC
- 109689-0
- Short code
- RSV Ag Msmt Nph
- Synonyms
- RSV Ag Msmt Nph
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 7.35
- Ref high
- 7.45
- Critical range
- 7.2 N/A – 7.6 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 Might Be Ordered
Your healthcare provider may order this test if you have a history of RSV infections, are at high risk for severe illness (e.g., infants, elderly, or immunocompromised individuals), or if you’re considering RSV vaccination. It can also help monitor immunity after vaccination.
What to Expect Before the Test
No special preparation is needed. A blood sample is typically drawn from a vein in your arm. If you’re concerned about discomfort, let your provider know so they can take steps to minimize it.
What the Test Results Mean
Higher antibody levels suggest your immune system has recognized and responded to RSV. Very low levels may indicate insufficient immunity, prompting further discussion about vaccination or infection risks.
Common Reasons for Testing
This test is often used to evaluate immunity before RSV vaccination, assess long-term protection, or identify individuals at higher risk of complications from RSV exposure.
Reference range
NCBI: pH 7.35-7.45N/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated RSV IgG levels indicate past exposure or vaccination-induced immunity. Low levels may warrant vaccination, especially if you’re in a high-risk group. This test does not diagnose active RSV infection but helps assess broader immune status.
Short name
RSV IgG Antibody Level
Frequently asked questions
How long does it take to get test results?
Can I fast before this test?
What if my results are outside the expected range?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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 17, 2026. · Read our editorial policy