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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms of HSV-1 infection (like cold sores), have had recent exposure to someone with HSV-1, or if you’re evaluating your immune response to the virus for medical or research purposes. It can also help assess whether you have been previously infected and may have developed immunity.

What to Expect Before the Test

No special preparation is needed. You may have a blood draw at your doctor’s office or a lab. If you’re taking blood at home, follow the instructions provided with your test kit carefully. The test uses a small sample of serum or plasma from your blood.

What the Test Results Mean

A positive result indicates the presence of HSV-1 IgG antibodies, suggesting you’ve likely been infected with HSV-1 at some point. The exact amount of antibodies can reflect the strength of your immune response. However, this test alone cannot confirm an active infection; it only shows past exposure.

Common Uses and Limitations

This test is useful for confirming past HSV-1 infection and assessing immunity but cannot diagnose an active infection. If you suspect you have an active HSV-1 infection (such as cold sores or genital herpes), your provider may recommend additional testing, like HSV culture or PCR.