Herpes Simplex Virus DNA Detection by Nucleic Acid Amplification (Serum/Plasma)

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like sores, fever, or unusual fatigue that could suggest an active herpes simplex virus infection. It may also be used to confirm a diagnosis when other tests are inconclusive or to check for viral load in certain clinical scenarios, such as evaluating immune response or guiding treatment decisions.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. If you’re taking blood thinners, let your provider know to avoid unnecessary bleeding. If you’re pregnant or have a history of bleeding disorders, inform your lab technician.

What the Test Results Mean

Positive results indicate the presence of HSV DNA, suggesting an active infection. Negative results mean no detectable viral DNA was found in your sample at the time of testing. Results alone don’t confirm the cause of symptoms—your provider will consider them alongside your medical history, symptoms, and possibly other tests.

Common Uses and Limitations

This test is primarily used to diagnose active herpes infections (e.g., genital or oral herpes) or monitor viral load in specific cases. It cannot distinguish between HSV-1 and HSV-2 without additional testing. Results may not be available immediately and could take 24–48 hours depending on the lab.