Respiratory Syncytial Virus (RSV) Nucleic Acid Detection (Serum/Plasma)

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms like fever, cough, or difficulty breathing, particularly if you’re at higher risk for severe RSV infection (e.g., young children, elderly adults, or those with weakened immune systems). It may also be used to confirm RSV infection in cases where other tests are inconclusive.

What to Expect Before the Test

No special preparation is needed. A blood sample is drawn from a vein, usually in your arm. The sample is then sent to a lab for analysis. The test looks for RSV genetic material, which can be detected even when symptoms are mild or early.

What the Test Results Mean

A positive result means RSV genetic material was found in your sample. This indicates an active RSV infection. A negative result means no detectable RSV genetic material was found, but this doesn’t always mean you’re not infected—it could be due to early infection, low viral load, or other factors.

Possible Outcomes and Next Steps

If your test is positive, your provider may recommend supportive care (like rest, fluids, and monitoring) while your body fights the infection. If RSV is suspected but not confirmed, additional testing or observation may be needed. Follow-up care depends on your symptoms, health status, and risk factors.