###1: Respiratory Syncytial Virus (RSV) IgA Antibody, Qualitative, Amniotic Fluid
###3: This test looks for RSV-specific IgA antibodies in amniotic fluid. It is a qualitative test, meaning the result is reported as detected or not detected.
["###4: Detecting RSV IgA in amniotic fluid may support an evaluation of fetal RSV exposure or infection, but the result must be interpreted with other clinical and laboratory findings."]
Key facts at a glance
- LOINC
- 9964-8
- Short code
- QRS I-Amp L-I
- Synonyms
- QRS I-Amp L-I
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ekg
- 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
###5: What This Test Measures
###6: RSV IgA is an antibody the immune system can produce in response to respiratory syncytial virus. This test checks whether that antibody is detectable in the amniotic fluid surrounding the fetus.
###7: When the Test May Be Used
###8: The test may be used in selected pregnancies when a clinician is evaluating possible fetal infection or exposure to RSV, particularly when other findings raise concern.
###9: Understanding the Result
###10: A detected result indicates that RSV-specific IgA is present and may support prior fetal exposure or infection. A not-detected result does not completely exclude infection, especially if the infection occurred recently or the fetus had not yet produced detectable antibodies.
###11: Limitations and Confirmation
###12: Antibody testing can be affected by timing and other factors, so the result may need confirmation with additional testing. The laboratory’s method and the treating clinician’s assessment are important when interpreting the result.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
###13: RSV is a common respiratory virus that can cause serious illness in infants and young children. Detection of RSV IgA in amniotic fluid may provide evidence of fetal exposure, but it does not by itself establish the severity of illness or the need for treatment; clinical findings, imaging, and other laboratory results should guide care.
Short name
###2: RSV IgA, amniotic fluid
Frequently asked questions
###14: Does a detected result mean the baby will have severe RSV disease?
###16: Can a not-detected result rule out RSV infection?
###18: Is this the same as a routine maternal RSV antibody test?
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 16, 2026. · Read our editorial policy