When to Get Tested for Herpes After Exposure

The right test depends on whether you have a sore right now, and a blood test taken too early can give a wrong answer. Here is how the CDC frames it.

When should I get tested for herpes after exposure?

It depends on whether there is a sore.

• You have a sore or blister. Get it swabbed as soon as you can. The CDC says swab tests are the most sensitive herpes tests, and a provider can swab a blister or sore that is not already crusted over or healing.
• You have no sore. A blood test looks for antibodies, which take time to develop. The CDC warns that if a blood test is done too soon after infection, “the result could be wrong.”

That is why “how soon can I test” has a different answer in each situation. If a sore appears, don’t wait it out: a swab is the quickest way to a clearer answer.

How long after exposure will a herpes blood test show?

The CDC says that after exposure, it can take up to 16 weeks or more for current tests to detect infection. In its treatment guidelines, the CDC says that if someone may have caught HSV-2 recently, repeat type-specific antibody testing 12 weeks after the presumed time of acquisition is indicated.

In plain terms:

• A negative blood test in the first weeks does not rule out a recent infection.
• The 12-week mark is when the CDC advises repeating the test if you tested early.
• Tests vary, and some people take longer, so a clinician can advise on your situation.

STDCheck’s herpes page recommends waiting at least four weeks after potential exposure. That is shorter than the CDC’s 12-week advice on repeat testing, so if you want the cautious answer, use the CDC timing. Our window-period calculator can help you count weeks, but for herpes a clinician’s advice matters more than a date.

My partner has herpes. When should I get tested?

The CDC’s answer to this exact question is to talk with your healthcare provider. Ask which tests are right for you and when to take them. Be open about your sexual history, and say whether you have noticed any symptoms. The CDC also says herpes blood tests may be considered when a partner has herpes, but that is a decision to make with a clinician rather than on your own.

Should I get tested if I have no symptoms?

The CDC recommends herpes testing for people who have genital symptoms, and it does not recommend testing everyone. Current herpes tests are not as exact as tests for chlamydia and gonorrhea, so false results are a real concern, especially for people at low risk.

The CDC says most people with genital herpes have no symptoms or have very mild symptoms, so the lack of a sore does not rule it out. If you are anxious about a specific exposure, talking with a clinician about whether a blood test makes sense for you is better than ordering one without context. See herpes blood test accuracy for what the results can and cannot tell you.

Is herpes included in a “full STD panel”?

Often it is not. The CDC says herpes blood tests may or may not be part of the tests your healthcare provider gives you. If you order a panel online or at a clinic, check the list, and add herpes by name if you want it.

Do I need to test again?

If you tested early and the blood test was negative, the CDC advises repeating about 12 weeks after the presumed exposure. If you get a low positive result, ask about a confirmatory test with a second method. If you develop a sore at any point, a swab is the quickest way to get a clearer answer.

What does a test cost and how fast are results?

Costs vary, so check the price with the clinic, lab or online service before you book. For results timing, point-of-care blood tests for HSV-2 antibodies give a result during a clinic visit, according to the CDC. STDCheck’s herpes page says results are ready in 1 to 2 days.