How Is Syphilis Actually Diagnosed?
Medically reviewed by our MD Laboratory Director (a role required by CLIA; the director's name is on file in the CMS CLIA database, #45D2048957, and can be verified independently) · Editorial policy
Syphilis is a blood test, not a swab — and it is confirmed with two steps, not one.CLIA #45D2048957 · CAP #8722734 · Same-day results · Walk-ins welcome
Syphilis is diagnosed serologically, with a two-step algorithm — a screening test and a confirmatory treponemal test. It is staged (primary, secondary, latent, tertiary), and treatment depends on the stage. The window period is roughly 3–6 weeks after exposure, sometimes longer.
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📱 Text (713) 832-8892 📞 Call (713) 266-0808
📱 Text (713) 832-8892 📞 Call (713) 266-0808
3707 Westcenter Dr Suite 100, Houston, TX 77042 · Walk-ins welcome
Stages, briefly
| Stage | Typical picture |
|---|---|
| Primary | A painless sore (chancre) at the site of infection — easily missed, heals on its own |
| Secondary | Rash, often including palms and soles; mucous patches; fever, malaise |
| Latent | No symptoms. The infection is still there, and still transmissible early on |
| Tertiary | Years later: cardiovascular and neurological damage |
The sore heals whether or not you treat it. People conclude they got better. They did not — the infection moved on without them.
Why this is not an abstract concern
Congenital syphilis — transmission from mother to fetus — has risen dramatically in the United States over the past decade, and it is preventable with testing and treatment in pregnancy. Benzathine penicillin G remains the CDC-recommended treatment; penicillin allergy requires specific management, which is a physician's decision.
We name drugs, never doses. Treatment statements follow CDC guidance; the dose, route and duration are decided by a licensed physician who has your result and your history.
Same day, start to finish. Sample by 1:00 PM → results at 4:30 PM → if treatment is clinically appropriate, a licensed physician in our partner network sees you between 4:30 and 6:00 PM, a few minutes away. That window is reserved for patients tested here, and your slot is held the moment we take your sample — the slot is held, not hunted. On your own, a same-day appointment is nearly impossible; at an urgent care, you wait in the queue. STAT: ~2 hours, sample in by 3:00 PM.
FAQ
- Why two blood tests?
- Because a single reactive screen can be a false positive. The two-step algorithm confirms it — see two-step serology.
- How long after exposure should I test?
- Roughly 3–6 weeks; repeat at 3 months after a high-risk exposure.
- Is syphilis curable?
- Yes, with penicillin, per CDC. What is not reversible is damage already done in late-stage disease — which is the argument for testing early.
- Do I need testing in pregnancy?
- Yes. CDC and obstetric guidance call for syphilis screening in pregnancy. Tell ythe partner-network physician if you are pregnant.
Not sure what you need? Text us and we will set it up.
📱 Text (713) 832-8892 📞 Call (713) 266-0808
📱 Text (713) 832-8892 📞 Call (713) 266-0808
3707 Westcenter Dr Suite 100, Houston, TX 77042 · Walk-ins welcome