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Alternative names Return to top
RSV antibody test; RSV serologyDefinition Return to top
RSV antibody test is a blood test that measures the levels of antibodies (immunoglobulins) against the viral infection respiratory syncytial virus (RSV).How the test is performed Return to top
Blood is drawn from a vein, usually on the inside of the elbow or the back of the hand. The puncture site is cleaned with antiseptic, and an elastic band is placed around the upper arm to apply pressure and restrict blood flow through the vein. This causes veins below the band to fill with blood.
A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. During the procedure, the band is removed to restore circulation. Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.
How to prepare for the test Return to top
No restrictions of food or fluid are required for this test.How the test will feel Return to top
When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.Why the test is performed Return to top
This test detects the body's response to RSV, not the virus itself. If the body has produced antibodies against RSV, then either a current or past infection has occurred.
In infants, RSV antibodies which have been passed from mother to baby may also be detected.
Normal Values Return to top
In infants, a positive test may detect RSV antibodies that were passed from mother to child. In children, a positive test may indicate either current or past infection with RSV. Most adults will have a positive test because most people have had an RSV infection.What abnormal results mean Return to top
A positive test in age groups other than infants indicates a current or past infection with RSV. Because most adults have had an RSV infection, a positive test most likely reflects a past infection.
In infants a positive test most likely reflects maternal antibody, and therefore may not indicate true infection with RSV.
What the risks are Return to top
Risks associated with having blood drawn are mild:Special considerations Return to top
This test is of limited value because it does not detect RSV directly. It is not recommended in infants because maternal antibodies may be detected, and it is not useful in adults as most people will have antibodies due to prior infection. Update Date: 8/15/2003 Updated by: Daniel Levy, M.D., Ph.D., Infectious Diseases, Greater Baltimore Medical Center, Baltimore, MD. Review provided by VeriMed Healthcare Network.
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Page last updated: 28 October 2004 |