STD Testing Guides
STD and STI testing: panels, window periods, and what each test detects.
What these guides cover
STD guides cover chlamydia, gonorrhea, HIV, syphilis, herpes, trichomoniasis, and full panels. They explain window periods, what each test detects, and why timing matters when you are testing after a possible exposure.
STD testing covers different organisms, and each test has its own window period, the time between possible exposure and when a test can reliably detect an infection. HIV, syphilis, chlamydia, gonorrhea, herpes, and trichomoniasis are detected in different ways and from different sample types. Some tests use blood, others use urine or a swab. Testing too early can produce a negative result even when an infection is present, so timing guidance matters for each test.
How to use these guides
Each guide below focuses on a single test or a small group of related tests. Start with the marker you and your clinician have discussed, then follow the related-test links to see what is often ordered alongside it. Preparation and timing instructions appear in each guide, and where testing is available is listed by state and city. These guides are educational and do not replace advice from a healthcare provider.
HIV Testing Guide: Test Types, Windows, and Results
Learn how HIV testing works, the difference between antibody, antigen, and RNA tests, why timing matters, and how to order confidential test
Herpes Testing Guide: Blood Tests, Swabs, and Timing
Learn how herpes testing works, the difference between type 1 and type 2, when blood tests are useful, and how to order confidential testing
STD Blood Test Guide: Timing, Accuracy, and Results
Learn how STD blood testing works, which infections are found by blood, and how to order confidential sexual health testing at a lab near yo
STD Testing FAQ
What is a window period?
A window period is the time after possible exposure before a test can reliably detect an infection. It differs by test and by organism, which is why a clinician may recommend retesting at a set interval.
Why do STD tests use different sample types?
Different organisms are detected in different ways. Some tests need blood, while others use urine or a swab from the site being tested, so the sample type depends on the specific infection.
When should I test after a possible exposure?
Timing depends on the test and the organism. Some tests are accurate within days, while others need several weeks. A healthcare provider can advise on the right interval and whether repeat testing is needed.
Reviewed by the LabDirectories Editorial Team
Our team researches and fact-checks all content to ensure accuracy. We update guides regularly to reflect current testing options, pricing, and laboratory accreditation standards.