Key takeaways
- There are two home routes: an over-the-counter rapid self-test you read yourself, and a mail-in kit or online lab order where a lab runs the test.
- FDA authorized the first over-the-counter syphilis self-test, the First To Know Syphilis Test, which checks a blood sample for antibodies to the syphilis bacterium.
- A positive self-test isn't a diagnosis. FDA says a positive should be followed by lab testing through a health care provider, and the test stays positive in people treated for syphilis in the past.
- A negative result isn't the final word after a recent exposure. FDA says anyone who may have been recently exposed should see a provider whatever the result. A sore or rash should be checked in person too.
- Pregnant people should get syphilis testing through prenatal care. CDC recommends testing at the first prenatal visit, and some people need repeat tests.
Short answer: Yes, you can start syphilis testing at home. FDA has authorized an over-the-counter self-test that looks for syphilis antibodies in a blood sample, and lab-based testing is available through mail-in kits and online lab orders (FDA). A home self-test can't tell a current infection from one treated in the past, and it can give false negatives as well as false positives. Any positive result needs follow-up lab testing through a clinician.
This guide focuses on choosing a home test and understanding its limits. If you've already had lab results and want to understand the RPR and treponemal tests behind them, see syphilis blood tests explained.
Two ways to test for syphilis at home
| Route | How it works | What you get |
|---|---|---|
| Over-the-counter self-test | You prick your finger and read the result yourself | A fast antibody result that needs confirmation if positive |
| Mail-in collection kit | You collect a blood sample at home and mail it to a lab | A lab result, usually after shipping and processing time |
| Online lab order | You order online, then give blood at a lab | A lab result, often with follow-up options; check what each service includes |
Only the first is a true "test at home." The other two move the ordering, and sometimes the collection, out of a clinic, but a lab still runs the test. Lab results generally fit more naturally into the confirmation steps a clinician would use.
The over-the-counter self-test
FDA granted marketing authorization to the First To Know Syphilis Test, made by NOWDiagnostics, through its De Novo review pathway. It was the first home syphilis test people can buy over the counter, without a prescription. According to FDA, it detects antibodies to Treponema pallidum, the bacterium that causes syphilis, in a blood sample, and gives a result in about 15 minutes (FDA).
FDA was clear about what that result means. The test alone isn't enough to diagnose syphilis. A positive result should be followed by lab testing ordered through a health care provider, and results shouldn't be used to start, stop or change treatment without one. FDA also says the test can't tell a current infection from a past one, and that anyone who may have been recently exposed should see a provider for evaluation and treatment, whatever the result.
Before you buy any self-test, check that the package names the authorized product, read the instructions on who it's meant for, and follow the reading time on the package exactly.
If a self-test is positive
A positive self-test means syphilis antibodies were found. It doesn't tell you whether you have an active infection that needs treatment now. Two common possibilities look the same on this kind of test:
- A current infection that needs treatment.
- A past infection that was already treated. FDA says results stay positive for people previously diagnosed with syphilis, even after successful treatment (FDA).
Sorting that out takes lab blood tests, usually a second, different kind of test, plus a clinician's review of your history. Our syphilis blood test guide explains how those tests fit together.
What to do next:
- Contact a clinician, sexual health clinic or health department and tell them you had a positive syphilis self-test.
- Mention any past syphilis diagnosis or treatment. It changes how results are read.
- Avoid sex until you've been evaluated and, if needed, treated.
- Think about partners. If an infection is confirmed, they'll need testing too. See how to tell a partner.
Our guide on what happens after a positive at-home STI test covers this step in more detail.
What a negative result can miss
FDA lists false negatives as one of the main risks of the self-test, and it says anyone who may have been recently exposed should see a health care provider regardless of the result. Antibody tests in general need time after an infection before they can pick it up, so a negative soon after an exposure may simply be too early. If you had a recent exposure, ask a clinician which test fits and whether you need a repeat, or see our guide to window periods.
A negative result also only covers syphilis. It says nothing about HIV, chlamydia, gonorrhea or other infections. Testing should match your exposures and the body sites involved.
Why a sore or rash should be seen in person
CDC describes the first stage of syphilis as a sore where the infection entered the body. The sore is usually, but not always, firm, round and painless, so it can go unnoticed. The next stage often brings a rash, which may show up on the palms or soles and usually doesn't itch (CDC). Many other conditions can cause sores or rashes too, and a home test can't tell them apart.
If you have a new sore, rash or other symptom, see a clinician rather than relying on a self-test. CDC notes that only lab tests can confirm syphilis, and a clinician can examine the area and decide which tests to run. Our symptom guide explains why photos and home tests aren't enough to know what a sore is.
If you're pregnant
Syphilis can pass to a baby during pregnancy, so testing during pregnancy belongs in prenatal care, not only at home. CDC recommends syphilis testing at the first prenatal visit for everyone who is pregnant. CDC's guidelines add repeat tests at 28 weeks and at delivery for people at risk during pregnancy or living in communities with high syphilis rates (CDC).
If you're pregnant and used a self-test, tell your prenatal provider about the result either way. A self-test doesn't replace the lab testing your prenatal care includes. Our guide to STI testing during pregnancy covers the full schedule.
Choosing between a self-test and a lab test
- A self-test may fit if you have no symptoms, no past syphilis, and you want a quick private first look, with a plan for follow-up if it's positive.
- A lab test is usually the better fit if you've had syphilis before, you had a recent known exposure, you want testing for several infections at once, or you'd rather get a result that fits directly into confirmation steps.
- See a clinician in person if you have a sore, rash or other symptoms, if you're pregnant, or if a partner told you they have syphilis.
Screening guidance also matters. The USPSTF recommends syphilis screening for adolescents and adults who aren't pregnant and are at increased risk (USPSTF). If that's you, regular testing through a clinic or lab may serve you better than an occasional self-test. Our at-home and online test comparison covers broader panels.
Prefer a lab syphilis test?
Order a syphilis blood test online, give blood at a lab
STDcheck lets you order lab-based syphilis testing online and give a blood sample at a participating lab. Check what its syphilis test includes and how it handles a reactive result before you buy. A lab test can't examine a sore, and a reactive result still needs follow-up with a clinician.
Visit STDcheck.com →Affiliate link: we may earn a commission at no extra cost to you. Free options are listed above.
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Start with your situation: timing, symptoms, and which body sites were involved. Our home page walks you through it.
Build a testing plan →Frequently asked questions
Is there an FDA-authorized at-home syphilis test?
Yes. FDA granted marketing authorization to the First To Know Syphilis Test, an over-the-counter self-test that checks a blood sample for syphilis antibodies. FDA says a positive result should be followed by lab testing through a health care provider.
Can a home syphilis test tell if I was treated in the past?
No. The antibodies the self-test looks for can stay positive after a past infection was treated. If you've had syphilis before, a lab test and a clinician's review are more useful than a self-test.
How soon after exposure can I take a syphilis self-test?
Antibody tests need time after an infection, so a test soon after exposure may be too early. FDA says anyone who may have been recently exposed should see a health care provider whatever the self-test shows.
I have a sore. Should I use a self-test?
It's better to see a clinician. Many conditions can cause sores, and a self-test can't tell them apart. A clinician can examine the area and decide which lab tests to run.
Should I use a home syphilis test if I'm pregnant?
Syphilis testing during pregnancy should happen through prenatal care. CDC recommends testing at the first prenatal visit, and some people need repeat tests. Tell your prenatal provider about any self-test result.
Sources
- FDA: Marketing Authorization Enables Increased Access to First Step of Syphilis Diagnosis
- CDC STI Treatment Guidelines: Syphilis During Pregnancy
- CDC: About Syphilis
- USPSTF: Syphilis Screening in Nonpregnant Adolescents and Adults
Guidance changes. When timing or treatment matters, check the current linked guidance or ask a clinician.
Disclaimer: This article is for informational purposes only and does not diagnose, prescribe, or replace individualized medical care. Testing and treatment decisions should be made with a qualified healthcare provider. Some links on this page are affiliate links; we may earn a commission at no extra cost to you.