Early pregnancy STD testing is a standard part of your first prenatal visit. Everyone who is pregnant is screened for HIV, syphilis, and hepatitis B, because treating these infections during pregnancy protects the baby USPSTF, pregnancy syphilis. Many providers also screen for chlamydia and gonorrhea, and some infections get a repeat test later in pregnancy if your risk is higher.
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Everyone 15–65 — HIV at least once
USPSTF
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Sexually active women under 25 — chlamydia & gonorrhea yearly
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Gay & bisexual men — at least yearly, throat/rectal too
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Everyone pregnant — HIV, syphilis, hepatitis B
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More often with new or multiple partners
| Item | Value |
|---|---|
| Everyone 15–65 — HIV at least once | — USPSTF |
| Sexually active women under 25 — chlamydia & gonorrhea yearly | |
| Gay & bisexual men — at least yearly, throat/rectal too | |
| Everyone pregnant — HIV, syphilis, hepatitis B | |
| More often with new or multiple partners |
What gets screened in early pregnancy
The first prenatal blood draw is built around the infections that can pass to a baby in the womb or during birth. HIV and syphilis are tested for every pregnant person regardless of how low-risk you feel, along with hepatitis B. Catching and treating these early changes the outcome for the baby, and you can carry any of them without a single symptom.
Chlamydia and gonorrhea screening follows the same risk-based rules used outside pregnancy. The USPSTF recommends screening all sexually active women under 25 every year, and older women who have new or multiple partners or other risk factors USPSTF, chlamydia & gonorrhea. If you fit those criteria, you'll get those tests in the first trimester too. For a fuller picture of who needs what at each age, see our women's sti screening guide.
How the tests work
Most early-pregnancy STD screening runs off one blood draw plus, in some cases, a urine sample or a swab. The blood tests look for the body's antibody response or the infection's proteins. The urine and swab tests look for the bacteria's genetic material directly.
- HIV is screened with a blood test that detects HIV antibodies and antigen, the same combination test used in routine adult screening that USPSTF recommends for everyone aged 15 to 65 USPSTF, HIV screening.
- Syphilis is a blood test that looks for the body's reaction to the bacterium that causes it; a reactive result is confirmed with a second, more specific blood test.
- Hepatitis B is a blood test for the surface antigen, a marker that the virus is present.
- Chlamydia and gonorrhea are usually a nucleic acid amplification test (NAAT), run on a urine sample or a vaginal swab you can often collect yourself, that finds the bacteria's DNA.
A self-collected vaginal swab tends to be as accurate as a clinician-collected one for chlamydia and gonorrhea, so you can ask for that option if a pelvic exam feels like more than you want at that visit.
When to test after a possible exposure
Screening at your first prenatal visit is timed to your pregnancy rather than to any one exposure, but the biology of the testing window still applies. Each infection has a stretch of time after exposure when it's present in your body but not yet detectable, because antibodies or bacterial load haven't risen enough. Testing too early can read negative even when an infection took hold.
If you had a specific high-risk encounter close to your prenatal visit, tell your clinician. You may need a repeat test after the relevant window passes rather than relying on a single early result. We break down each infection's detection window in our guide on when to test after exposure.
You're testing because catching a silent infection protects the baby, even when you have no symptoms. How often you retest during pregnancy is driven by risk: new or multiple partners, a partner who tested positive, or inconsistent condom use, rather than how you feel.
Third-trimester retesting triggers
A negative early-pregnancy panel doesn't always close the question. Several infections are retested later in pregnancy when risk factors are present, because an exposure after the first trimester could still reach the baby near delivery. Common reasons to retest in the third trimester include:
- A new or additional sex partner during the pregnancy.
- A partner known or suspected to have an STI.
- Living in or being from an area with high rates of syphilis, which prompts repeat syphilis testing later in pregnancy.
- Being under 25 or otherwise meeting risk criteria for repeat chlamydia and gonorrhea screening.
- Any symptoms, unusual discharge, sores, or pelvic pain, that develop after the first visit.
Some infections are also rechecked at delivery so the newborn can be treated immediately if needed. Ask your clinician which of your tests are scheduled to repeat and why.
Where to get tested and what it costs
In pregnancy, this screening is built into prenatal care, so the panel typically runs with your other first-visit labs at an OB-GYN, midwife practice, family medicine clinic, or community health center. Prenatal STI screening is generally covered without a separate out-of-pocket charge under most insurance, and clinics that serve uninsured pregnant patients can usually arrange low- or no-cost testing.
If you want a test outside a prenatal visit, say, before you've established care, or to check a recent exposure, you can get tested through a clinic or a mail-in lab. If you're weighing options, you can compare testing providers on cost, turnaround, and which infections each panel covers.
Reading your results and how accurate they are
NAAT urine and swab tests for chlamydia and gonorrhea are highly accurate when taken after the window has passed, so they're the standard. HIV antigen/antibody tests and the syphilis and hepatitis B blood tests are also reliable, though screening tests are designed to err toward catching infection, so a reactive screen is confirmed with a second, more specific test before it's treated as a diagnosis.
A positive syphilis screen doesn't immediately mean active disease, because the first test can stay reactive after a past, treated infection. The confirmatory test sorts that out. If anything on your panel comes back reactive or positive, your clinician will walk you through the confirmatory step before any treatment decision.
If a result is positive
Most STIs found in pregnancy are treatable, and early treatment protects you and the baby. Your clinician will start a regimen safe for pregnancy and may retest later to confirm it cleared. For what treatment involves and timelines, see our treatment guide; for HIV specifically, starting care early matters for the pregnancy and for prevention, read why earlier hiv treatment can help prevention.
When to see a clinician
Get prenatal care early, ideally as soon as you know you're pregnant, so this screening happens in the first trimester when treatment has the most benefit. Contact your clinician sooner than your next scheduled visit if you develop unusual vaginal discharge, genital sores, pelvic pain, burning with urination, or if a partner tells you they tested positive. Don't wait for the next routine appointment to mention a new exposure; it may change which tests you need and when.
One practical habit: tie testing to events rather than symptoms. A new partner, an annual checkup, or starting any new prevention plan are all natural prompts to ask what you should be screened for. Ask specifically for throat or rectal swabs if those sites apply to you, since a urine test alone misses infection there.