Respiratory Syncytial Virus (RSV) Antibody Titration (Serum)

Why Is This Test Done?

Your healthcare provider may order this test to assess your immune response to RSV, especially if you’ve had a recent infection, are at high risk for severe illness, or if you’re being considered for preventive treatments like palivizumab (Synagis). It can also help monitor immunity after vaccination or exposure.

A blood sample is taken from a vein in your arm. The sample is sent to a lab where antibodies specific to RSV are measured using a sensitive immunoassay method.

The test measures the strength of your immune response by detecting RSV antibodies in your serum. Results are reported as a titer (a numerical value indicating antibody concentration).

No specific numeric reference ranges are provided here, as they can vary by lab and clinical context. Results are interpreted in relation to your medical history, symptoms, and risk factors.

A high titer may indicate past infection or immunity, while a low titer could suggest recent exposure or lack of immunity. Your doctor will discuss findings with you based on your individual situation.

What Are Possible Causes of Abnormal Results?

Low antibody levels might be due to recent RSV infection, lack of prior exposure, or weakened immune function. High levels could reflect past infection, vaccination, or chronic immune activation. Other factors like recent treatments or underlying health conditions may also influence results.