Possible exposure · What to do next

What to Do After Unprotected Sex

After unprotected sex, some steps are time-sensitive, and the first step is not simply waiting for an STI test. Testing right after an exposure can be too early to detect a new infection, and depending on the exposure, prompt medical evaluation may be appropriate. This page explains what to do now and when testing becomes useful.

Time-sensitive: HIV PEP within 72 hours

Waiting for an STI testing window is not the same as waiting to seek medical care. HIV post-exposure prophylaxis (PEP) is time-sensitive: CDC states that PEP must be started within 72 hours (3 days) after a possible exposure. If you think PEP may be relevant to your situation, contact a healthcare provider, urgent care, or an emergency department promptly rather than waiting for an STI testing window. LabTestsOnDemand provides laboratory testing only and does not provide PEP, treatment, or emergency care.

Source: CDC — Preventing HIV with PEP

What to do now

1
Note the date of your most recent possible exposure
Testing timing is generally counted from that date, not from an earlier encounter.
2
Consider whether you may need time-sensitive medical care
Some options after a possible exposure are time-limited. Waiting for a testing window is not the same as waiting to seek care.
3
Understand that testing immediately may be too early
A test taken very soon after an exposure may not detect an infection acquired during that exposure.
4
Check when testing becomes more informative
Our dedicated timing guide covers how long after exposure to wait before STI testing, infection by infection.
5
Follow appropriate repeat-testing guidance when needed
Depending on the infection and test method, a follow-up test may be appropriate. A qualified healthcare provider can advise.

Count from your most recent possible exposure

Count testing timing from your most recent possible exposure relevant to your concern. If another possible exposure occurs while you are waiting to test, the timing calculation may need to restart from that more recent exposure. A clinician can help determine what timing applies to an individual situation.

Testing now vs. testing later

Testing soon after an exposure can sometimes provide baseline information about infections you may have had before the encounter. That is a personal decision, and it is not something everyone needs.

A test performed too early may not detect an infection acquired during the recent exposure, so a negative early result does not necessarily rule out a recent infection. Follow-up testing may be appropriate depending on the infection, the test method, the timing of the exposure, and clinical guidance.

When testing becomes more informative

Different infections and test methods become detectable at different times. Some bacterial STI testing is commonly considered around 1–2 weeks after an exposure, while blood-based infections can require longer. Approximate timing varies by infection, test method, and clinical context, and no test becomes perfectly accurate on one universal day.

Timing differs largely because some tests look for the organism itself while others look for the body's antibody response, which takes time to develop. Test sensitivity and the specific sample type also affect when an infection can be detected. how STI window periods and detection timing work covers that science in detail.

Looking for exact days and weeks by infection?

See the full STI testing timing chart by infection — that guide owns the per-infection timing detail.

If you are ready to test: LabTestsOnDemand panels

Ordering a test and having reached an informative testing time are not necessarily the same thing. If you are still early in the detection period for your recent exposure, testing immediately may not give a reliable answer about that exposure. You can order now and complete collection later, or wait until the timing fits your situation.

Standard

Standard Sexual Health Panel

$189 flat self-pay

✓HIV
✓Syphilis
✓Hepatitis B
✓Hepatitis C
✓Gonorrhea
✓Chlamydia

Order the Standard Panel — $189 →

Comprehensive

Comprehensive Sexual Health Panel

$269 flat self-pay

✓Everything in the Standard Panel
✓HSV-1 (herpes)
✓HSV-2 (herpes)
✓Trichomoniasis

Order the Comprehensive Panel — $269 →

A note on herpes: CDC does not recommend routine HSV blood testing for everyone without symptoms, because results can be difficult to interpret in people at low risk (see CDC — Screening for Genital Herpes). HSV-1 and HSV-2 antibody testing is included in the Comprehensive panel for people who want that broader screening; a qualified healthcare provider can help interpret results.

Want to compare costs against urgent care and clinic self-pay rates? See STD testing cost without insurance. Curious how results are interpreted? See false positive STD test results.

Who this is for

This page is written for adults who want a private, structured next step after a possible exposure — for example:

✓Unprotected sex with a new or unknown-status partner
✓A condom that broke or slipped
✓A partner disclosed a positive result or recent exposure
✓General anxiety or uncertainty after a recent encounter
✓Routine private screening between partners

How testing works when you are ready

1
Order online
Choose the Standard ($189) or Comprehensive ($269) panel and pay one flat self-pay price.
2
Receive paperwork and instructions
Lab paperwork and Labcorp instructions are emailed after your order is processed.
3
Visit Labcorp for professional collection
Trained Labcorp staff perform the blood draw and urine collection at any Labcorp Patient Service Center.
4
Receive secure results
Results are delivered to your private online account once finalized by the lab.

Not sure what the appointment itself involves? See what to expect at a Labcorp STI visit.

Important medical note

If you have symptoms, a possible high-risk exposure, pregnancy concerns, possible sexual assault, or any other urgent medical concern, please contact a qualified healthcare provider or urgent care promptly. This page is general education and is not a substitute for individualized medical advice, diagnosis, or treatment.

Frequently asked questions

What should I do right after unprotected sex?

Note the date of your most recent possible exposure, then consider whether the situation may call for prompt medical evaluation rather than waiting for a test. Some care options are time-sensitive. Once you are past that decision, testing timing becomes the next question.

Should I get tested immediately?

Ordering a test right away is possible, but a test taken very soon after an exposure may be too early to detect an infection acquired during that exposure. Some people test early for baseline information and then retest later. A qualified healthcare provider can help decide what applies to your situation.

Can an STI test the next day detect a new infection?

Generally no. Most STI tests are not expected to reliably detect an infection acquired within the past 24 hours, so a negative result that soon does not rule out a recent exposure.

What if I am still within 72 hours of a possible HIV exposure?

HIV post-exposure prophylaxis (PEP) is time-sensitive. CDC states PEP must be started within 72 hours (3 days) of a possible exposure. If you think PEP may be relevant, contact a healthcare provider, urgent care, or an emergency department promptly rather than waiting for an STI testing window. LabTestsOnDemand provides laboratory testing only and does not provide PEP, treatment, or emergency care.

What if I have symptoms?

If you have symptoms, a known high-risk exposure, pregnancy concerns, possible sexual assault, or any other urgent concern, contact a qualified healthcare provider or urgent care promptly instead of waiting on a self-ordered lab test.

What if I had another possible exposure while waiting to test?

Testing timing is generally counted from your most recent possible exposure relevant to your concern. If another possible exposure happens while you are waiting, the timing may need to restart from that more recent date. A clinician can help determine what timing applies to an individual situation.

Is this an at-home test?

No. Collection is performed by trained Labcorp staff at a Labcorp Patient Service Center. This is professional in-person blood and urine collection — not a self-collected mail-in kit.

Will LabTestsOnDemand bill insurance?

No. There is no insurance billing by LabTestsOnDemand. You pay one flat self-pay price at checkout.

Ready when you are

Private STI Testing After Possible Exposure

One flat self-pay price. Drawn at Labcorp. No insurance billing by LabTestsOnDemand. Secure results delivered to your private online account.

Start Private Order

Sources

Centers for Disease Control and Prevention — Preventing HIV with PEP: cdc.gov/hiv/prevention/pep
Centers for Disease Control and Prevention — Getting Tested for STIs: cdc.gov/sti/testing
Centers for Disease Control and Prevention — Getting Tested for HIV: cdc.gov/hiv/testing
Centers for Disease Control and Prevention — Testing for Hepatitis C: cdc.gov/hepatitis-c/testing
Centers for Disease Control and Prevention — Screening for Genital Herpes: cdc.gov/herpes/testing
MedlinePlus (NIH) — Sexually Transmitted Infections: medlineplus.gov/sexuallytransmittedinfections

This page is for general education and is not a substitute for individualized medical advice, diagnosis, or treatment. Talk with a qualified healthcare provider about your specific situation.