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

Why This Test Is Done

Doctors may order this test if you have symptoms of RSV infection (such as coughing, wheezing, or difficulty breathing), if you’re at high risk for severe RSV (like young infants, older adults, or those with weakened immune systems), or if you’re planning to travel to areas where RSV is common.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The test may be done at a clinic, hospital, or lab. If you’re pregnant or have a history of bleeding disorders, let your healthcare provider know before the test.

What the Test Results Mean

Positive results suggest you’ve been exposed to RSV or have developed immunity. Negative results mean no detectable antibodies were found, which could indicate no prior exposure or recent infection. Quantitative results may show the level of antibodies, which can help assess immunity strength.

Possible Side Effects

Most people experience mild discomfort or bruising at the injection site. Rarely, there may be a slight swelling or redness. If you experience excessive bleeding, severe pain, or signs of infection (like fever or pus), contact your healthcare provider.