Herpes Simplex Virus IgG Antibody, Serum

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms or a history of herpes (e.g., cold sores or genital herpes), unexplained recurrent infections, or if you’re evaluating for exposure in a high-risk setting (e.g., pregnancy, organ transplant, or immune-compromised conditions).

What to Expect During the Test

A small blood sample is drawn from a vein, usually in your arm. The sample is sent to a lab for analysis. You may feel a slight pinch, but it typically takes only a few minutes. No special preparation is needed.

What the Results Mean

Positive results indicate the presence of HSV IgG antibodies, suggesting past infection and immunity. Negative results mean no detectable antibodies, which may imply no prior exposure or insufficient immune response. Results alone don’t confirm active infection; they’re used alongside clinical findings and symptoms.

Common Reasons for Testing

This test helps diagnose past HSV exposure, assess immune status, or guide decisions in high-risk scenarios (e.g., pregnancy, organ donation, or immune-related conditions). It’s not used to diagnose active herpes outbreaks.