Chlamydia TestThis test detects Chlamydia trachomatis, one of the most common sexually transmitted infections (STIs). Many people with chlamydia may not experience symptoms, which is why regular screening is important, especially if you're sexually active. Untreated, chlamydia and other STIs can cause serious health complications. Testing is the only way to know for sure if you have an STI and to ensure timely treatment. Signs & Symptoms The Chlamydia Test can be