Herpes Simplex Virus Type 1 IgG Antibody, Quantitative (Serum/Plasma)

What Does This Test Measure?

The test detects IgG antibodies specific to HSV-1, which develop after your body has encountered the virus. These antibodies are a sign that your immune system has recognized and responded to the virus, often months or years after initial infection. IgG antibodies remain in your blood for a long time and can indicate past exposure, even if you no longer have active symptoms.

Why Might You Need This Test?

Your healthcare provider may recommend this test if you have symptoms of HSV-1 infection (such as cold sores), a history of cold sores, or if you’re at risk for exposure (e.g., through sexual contact, sharing personal items, or immune-compromised conditions). It can also be used to confirm past infection in certain clinical scenarios.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The sample is then sent to a lab for analysis using an immunoassay method, which detects the presence of HSV-1-specific IgG antibodies in your serum or plasma.

What Are the Possible Results?

Results are typically reported as either positive or negative for HSV-1 IgG antibodies. A positive result suggests past exposure to HSV-1, while a negative result indicates no detectable antibodies at the time of testing. Interpretation depends on clinical context and symptoms.