Syphilis Testing: Stages, Tests, and What Results Mean
Syphilis is a bacterial infection that develops in stages and can remain silent for years. Screening usually starts with a nontreponemal test such as RPR, and a positive result is confirmed with a treponemal test. The window period is roughly three to six weeks after exposure. Syphilis is curable with penicillin, and treating it early prevents long-term complications. Walk-in testing makes it easy to order a syphilis blood test confidentially. This guide explains how the two-step testing process works and why both a screening and a confirmatory test may be needed.
Key Takeaways
- Syphilis testing typically uses a two-step approach: a screening test such as RPR, then a confirmatory treponemal test.
- A common window period is about three to six weeks after exposure.
- Syphilis is curable with antibiotics, and early treatment prevents serious complications.
- A positive screening test must be confirmed because false positives can occur.
- Pregnant people are routinely screened because syphilis can pass to the baby.
Frequently Asked Questions
What is the difference between RPR and a treponemal test?
RPR is a nontreponemal screening test that can rise and fall with active infection. A treponemal test confirms that the antibodies are specific to syphilis.
How long after exposure does syphilis show up on a test?
Most tests turn positive about three to six weeks after exposure. Testing too early can miss a new infection.
Can syphilis be cured?
Yes. Early syphilis is cured with penicillin or another antibiotic. Later stages need longer treatment, so early detection matters.
Why do I need two syphilis tests?
The screening test can occasionally be positive for reasons other than syphilis, so a confirmatory test is used to be sure before treatment.
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