Herpes Simplex Virus Type 1 (HSV-1) Antibody, Qualitative (IgG)

What Does This Test Measure?

The test detects IgG antibodies against HSV-1, which develop after initial infection and can persist for years. These antibodies indicate your immune system has recognized and responded to the virus, but they do not confirm an active infection. This test is qualitative, meaning it only provides a positive or negative result rather than a measured amount.

Why Might Your Doctor Order This Test?

Your doctor may recommend this test if you have symptoms suggestive of herpes (e.g., sores, pain, or recurrent outbreaks), a history of HSV-1 exposure, or if you’re evaluating for past infection in a clinical or research setting. It’s also sometimes used to confirm exposure in certain medical or epidemiological contexts.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The sample is processed to detect HSV-1 antibodies using an immunoassay method, which identifies the presence of these antibodies without quantifying their exact concentration.

What Are Possible Results?

A positive result means your blood contains detectable HSV-1 antibodies, suggesting past exposure. A negative result indicates no detectable antibodies, meaning either you’ve never been exposed or the antibodies have cleared from your system. This test cannot distinguish between past and recent infection.