Chlamydia retest - why the 4-6 week wait time? why not 7 days after end of treatment?

Chance of false pos: Testing is for chlamydial DNA, which persists for a while after the organism has been killed. Many cured persons willstill have false positive tests at 7 days. Chlamydia testing should not be repeated before 3 weeks after treatment. Retesting even at 4-6 weeks usually isn't necessary. Treatment failure is so rare that standard advice is to retest at 3-6 months, mostly to detect reinfection.