Chlamydia test: Have you had yours this year? - MayoClinic.com

"To get a chlamydia test, you don't need a complete gynecologic exam — just a urine sample. If you're age 24 or younger and you've ever had sex, you owe it to yourself to get tested as soon as you can. A yearly chlamydia test is recommended for all sexually active women younger than age 25."