Many people assume there is one STI test that detects every sexually transmitted infection. In reality, different infections require different tests, sample sites, and timing. Dr. Johanna Janku explains how STI testing works, why one swab is often not enough, and when testing may be appropriate, even if you don't have symptoms.

Many sexually transmitted diseases (STDs) cause few or no symptoms, making them easy to miss. Learn why feeling healthy doesn't necessarily mean you're infection-free, when STD testing is recommended, and how choosing the right test depends on the infection, the anatomical site being tested, and the timing of testing.