Quick Answer
Retesting after STI treatment follows infection-specific schedules: chlamydia warrants a test-of-cure at 4 weeks (pregnant patients especially), gonorrhea culture-confirms at 1–2 weeks given resistance concerns, and syphilis titers track quarterly until demonstrating appropriate decline.
- Chlamydia test-of-cure: NAAT at ≥4 weeks post-treatment — earlier testing detects residual dead organisms falsely.
- Gonorrhea: recheck 1–2 weeks after treatment given rising ceftriaxone resistance.
- Syphilis: quantitative RPR titers at 3, 6, and 12 months confirming fourfold decline.
- Reinfection prevention: partner treatment completion BEFORE resuming unprotected contact.
The Short Version, Structured
Post-treatment testing serves distinct purposes by infection: verifying cure (bacteria), monitoring therapeutic response (syphilis titers), or catching reinfection (common within months when partners went untreated simultaneously).
The reinfection pattern
Most post-treatment positives represent REINFECTION from untreated partners rather than treatment failure — which is why expedited partner therapy (treating both simultaneously) exists as standard practice.
Scheduling efficiently
Book test-of-cure appointments before finishing antibiotics. Calendar reminders prevent the forgetting that leaves reinfections circulating between partners indefinitely.
Sources & Further Reading
- CDC — Sexually Transmitted Infections
- CDC STI Treatment Guidelines
- WHO — Sexually transmitted infections fact sheet
- MedlinePlus — Sexually Transmitted Diseases
Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.