Herpes Simplex Virus 1 and 2 (IgG) Test
This blood test looks for IgG antibodies to herpes simplex virus type 1 and type 2 — the immune system's long-term response to these viruses. A result with an ambiguous HSV-2 finding is automatically sent for an additional inhibition step to clarify it.
About this test
Herpes simplex viruses are extremely common. HSV-1 is the type most often associated with oral cold sores and is frequently acquired in childhood, while HSV-2 is more often associated with genital infection, though either type can affect either area.
IgG antibodies are the immune system's durable memory. They usually take several weeks to develop after an initial exposure and then tend to remain for life.
Who might consider this test?
- Order type-specific herpes antibody testing when a partner has disclosed a diagnosis
- When they want a complete picture of their sexual health status
- Before or during a new relationship
Test details
| Collection | Quest patient service center |
|---|
Quest resources
Additional details
What IgG antibody testing shows
This assay looks for antibodies rather than for the virus itself. Type-specific testing distinguishes the antibody response to HSV-1 from the response to HSV-2, which matters because the two types have different typical patterns.
Because antibodies take time to appear, a test performed shortly after a possible exposure may not yet reflect it. A clinician can advise on timing and on whether repeating the test later would be informative.
Antibody testing versus swab testing
If someone has an active sore, a swab of that lesion is generally the more direct approach, because it looks for viral material at the site. Antibody testing serves a different purpose: it speaks to prior exposure when there is nothing to swab.
Choosing between them depends on the situation, and it is a good question to raise with a clinician. Ordering the test that matches the question saves both money and confusion.
How results are interpreted
Herpes antibody results are one of the areas where interpretation genuinely requires a clinician. Values that sit near the boundary between negative and positive can be difficult to read, which is exactly why this test includes an automatic inhibition step for uncertain HSV-2 findings. Even with that, a clinician weighs the result against symptoms, history, and a partner's status before drawing conclusions.
Public health guidance also notes that antibody screening is not recommended for everyone, precisely because of these interpretation challenges. That is not a reason to avoid testing if you want the information — it is a reason to plan on discussing the result with someone who can put it in perspective.
Privacy, cost, and next steps
Collection takes a few minutes at a Quest patient service center. Your report is delivered securely to you, and any conversation about it happens on your terms. Herpes is common, manageable, and something clinicians discuss routinely and without judgment.
This test isn't part of the Celio Health store at the moment, so it can't be ordered or requested here. The test menu lists everything that can.
Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.
Frequently asked questions
What does an HSV IgG test look for?
It looks for IgG antibodies, the immune system's long-term response to herpes simplex virus type 1 and type 2. It speaks to prior exposure rather than to whether a sore is active right now.
What is the HSV-2 inhibition reflex?
When an HSV-2 antibody result falls in an uncertain zone, the laboratory automatically performs an additional inhibition step to help clarify the finding, at no extra charge to you.
Should I get a blood test or a swab?
A swab of an active sore looks directly for viral material at the site. A blood antibody test speaks to prior exposure when there is nothing to swab. A clinician can help match the test to your situation.
How soon after exposure would antibodies show up?
IgG antibodies typically take several weeks to develop, so testing very soon after a possible exposure may not reflect it. Ask a clinician about timing and whether a later repeat would be useful.
Is this test private?
Yes. Your result is delivered securely to you as a PDF, and because you pay directly, nothing is submitted to an insurer.