What are the CDC guidelines for Chlamydia trachomatis (CT) testing and re-testing?

Routine Screening

All sexually active women under age 25 should be tested once a year.
Women over 25 with risk factors such as new/multiple partners should also be tested annually.
Pregnant women should be tested at their first prenatal visit; if at continued risk, retest in the third trimester.
Men who have sex with men (MSM) should be tested at least once a year at exposed sites (urethra, rectum, throat), and every 3–6 months if at higher risk.
Routine screening in heterosexual men without risk factors is generally not recommended, except in high-prevalence settings.

Re‑testing After a Positive Result

Anyone who tests positive for chlamydia should be retested approximately 3 months after treatment to detect possible reinfection.
If a 3-month follow-up isn't possible, retest at the next healthcare visit within 12 months.
A test of cure (4 weeks after treatment) is not routinely recommended for nonpregnant individuals except in pregnant persons, persistent symptoms, or suspected treatment failure.