HSV-1 Testing Window – When to Test After Exposure

If you think you’ve been exposed to HSV-1—whether through kissing, oral contact, or shared items—it’s natural to want clear answers. But herpes doesn’t show up on a test immediately after exposure. Like many infections, HSV-1 has a “testing window” during which the virus may not be detectable yet, even if it’s present in your system.

This page breaks down how long you should wait before getting tested, what kind of test to use, and how to interpret your results based on timing and symptoms.

What Is the HSV-1 Testing Window?

The “testing window” refers to the time between infection and when a test can reliably detect the virus. For HSV-1, this depends on the type of test:

• Swab test: Detects the virus itself from an active sore. Accurate only during an outbreak.
• Blood test (IgG antibody): Detects your body’s immune response. Antibodies usually take 2 to 12 weeks to appear after infection.

Most people who take an HSV-1 blood test too soon after exposure will get a negative result—not because they aren’t infected, but because their body hasn’t produced enough detectable antibodies yet.

When Should You Get Tested?

If you’ve had a recent potential exposure but don’t have symptoms, the ideal time to take a blood test is around 6 to 12 weeks post-exposure. Testing earlier than 2–3 weeks is unlikely to give an accurate result.

If you have visible sores or symptoms (such as tingling or blisters), a provider may recommend a swab test during the outbreak instead of—or in addition to—a blood test.

How Accurate Are HSV-1 Tests?

HSV-1 tests are generally accurate if done at the right time, but no test is perfect:

• Swab tests: Highly accurate during an active outbreak if taken within 48 hours of sore appearance.
• Blood tests: Accurate at detecting past exposure after antibodies form, but less helpful if taken too soon or for diagnosing a new infection.

Some at-home test kits or local labs use combination testing (HSV-1 and HSV-2) to give you a complete picture of your herpes status.

Why Timing Matters

Testing too early can lead to false negatives, which may give a false sense of security. On the other hand, delaying testing for too long—especially if you’re sexually active—could increase the risk of spreading HSV-1 without knowing it.

If you’ve recently kissed someone with a cold sore, had oral contact, or suspect exposure, mark your calendar and plan to test no sooner than 3 weeks after that date. If your first test is negative but you’re still concerned, retesting at the 12-week mark may give you a clearer answer.

What If You Already Have Symptoms?

If you’re experiencing any signs of HSV-1—such as cold sores, tingling around the mouth, or blisters—don’t wait. A healthcare provider can perform a swab test during the outbreak. This is often the most direct way to confirm the infection.

After symptoms resolve, an antibody blood test may help confirm whether you’ve had a prior HSV-1 infection. This is also helpful for partners trying to assess exposure risk over time.

Where to Get Tested for HSV-1

You can get tested through your doctor, a local clinic, or a private testing provider. Many people prefer the convenience and privacy of at-home kits or direct-to-lab services.

Two reliable options include:

• STDCheck – Offers type-specific herpes testing at over 4,500 labs nationwide
• myLAB Box – At-home test kits for herpes and other STDs, mailed discreetly to your door

FAQs About HSV-1 Testing Timing

How soon after exposure can HSV-1 be detected?

Swab tests may detect the virus during an active outbreak. Blood tests usually become accurate between 6 and 12 weeks post-exposure.

Can I test too early?

Yes. Testing within the first 1–2 weeks often leads to a false negative. Waiting at least 3 weeks gives better odds of an accurate result.

Do I need to test again if my first result is negative?

If you tested within the window period and had a potential exposure, retesting at the 12-week mark is often recommended for confirmation.

Sources

• CDC – Herpes Screening FAQ
• Mayo Clinic – Herpes Testing
• Johns Hopkins Medicine – Genital Herpes: Diagnosis