Most people can get an accurate chlamydia test about two weeks after exposure. A NAAT — the recommended test — can technically detect the bacterium sooner, but enough genetic material has to build up to avoid a false-negative. If symptoms appear, they usually show up within one to three weeks CDC, About Chlamydia, the same window.
urine or swab
after exposure
100 mg 2×/day, 7 days
catches reinfection
| Item | Value |
|---|---|
| Test method | NAAT — urine or swab |
| When to test | ~2 wks — after exposure |
| Treatment | doxycycline — 100 mg 2×/day, 7 days |
| Retest | 3 mo — catches reinfection |
How chlamydia is tested
Chlamydia is caused by the bacterium Chlamydia trachomatis, and most US genital infections come from serovars D through K. The test looks for that organism's genetic material rather than your antibody response, so it doesn't behave like a blood-based STI test.
The recommended method is a NAAT (nucleic acid amplification test), the optimal approach for both genital and extragenital infection CDC STI Treatment Guidelines, 2021. A NAAT copies and amplifies any chlamydial DNA or RNA in your sample until there's enough to detect. That amplification makes it sensitive, and a sample taken too early may not contain enough material yet.
The sample depends on where exposure happened. Options include first-catch urine, an endocervical swab, a self-collected vaginal swab, a male urethral swab, and rectal or pharyngeal swabs. Test each site of exposure, because a urine test won't catch a throat or rectal infection. For a fuller breakdown of test types and accuracy, see how to get tested.
When to test after exposure (the window)
The most common mistake is testing the morning after a hookup. Chlamydia has an incubation period — the bacteria need time to replicate at the site of infection — so a NAAT is most reliable about two weeks out. An early negative can be falsely reassuring, because the test simply couldn't find enough organism yet.
If you test before that window and the result is negative but you had a real exposure, repeat the test at the two-week mark. If you test after symptoms start, the timing usually already works in your favor, since symptoms tend to appear within one to three weeks. We walk through the math for every infection on our guide to when to test after exposure.
Who should get screened
Screening guidance is deliberately asymmetric because of the complication burden. The USPSTF (September 2021, Grade B) recommends screening all sexually active women aged 24 or younger, and women 25 and older at increased risk, including pregnant people USPSTF, 2021. For men, the USPSTF issued an I-statement, insufficient evidence, because the serious downstream harms, like pelvic inflammatory disease and infertility, fall on women.
The CDC adds guidance for men who have sex with men: at least annual screening at all sites of exposure (urethral or urine, rectal, and pharyngeal), and every three to six months for those at higher risk. Anyone diagnosed with chlamydia should also be offered HIV testing, since the same exposures overlap.
- All sexually active women 24 and under — screen at least once a year.
- Women 25+ with new or multiple partners, or a partner with an STI.
- All pregnant people, as part of routine prenatal care.
- Sexually active MSM — at least yearly, at every exposed site; more often if higher risk.
- Anyone with symptoms, a known exposure, or a partner who tested positive.
What getting tested is actually like
Testing for chlamydia is simpler than people expect. There's no blood draw and, in most cases, no urethral swab. You'll either pee into a cup (a first-catch sample — hold your urine for about an hour beforehand so the bacteria aren't flushed out) or collect a swab yourself. Results are often texted back within one to three days.
Access is broad. Testing is free or low-cost at Planned Parenthood, local health departments, and Title X clinics, and it's often $0 with insurance. At-home kits run roughly $50 to $150 and mail you a collection kit with a prepaid return label. If you're weighing mail-in options, you can compare testing providers before you buy.
| Where you test | Sample | Typical cost | Turnaround |
|---|---|---|---|
| Planned Parenthood / health dept / Title X | Urine or self-swab | Free to low-cost | A few days |
| Primary care or urgent care | Urine or swab | Often $0 with insurance | A few days |
| At-home mail-in kit | Self-collected, mailed in | ~$50–150 | After lab receives sample |
Reading your results
A negative NAAT taken at the right time is reliable. If your test was within the first days after exposure, treat a negative as provisional and retest at about two weeks. A positive result means active infection and should be treated. It doesn't tell you how long you've had it, since chlamydia is frequently silent.
Don't read a single negative as a clean bill of health for sites you didn't sample. If exposure included oral or anal sex, those sites need their own swabs. A urine NAAT cannot speak for the throat or rectum.
If your result is positive
Chlamydia is curable with antibiotics. Current first-line treatment is doxycycline, and your partners should be treated too. See our full guide to chlamydia treatment for regimens, recovery, and retesting timing.
Genital and rectal chlamydia
For genital and rectal infection, doxycycline is now preferred over the older single-dose azithromycin. A randomized trial found doxycycline cured every case of rectal chlamydia, versus a much lower cure rate with azithromycin RCT, rectal chlamydia, and the 2021 guidelines shifted to doxycycline first-line. Dosing and how to take it are covered on the chlamydia treatment page.
Lymphogranuloma venereum (LGV)
LGV is caused by invasive C. trachomatis serovars L1, L2, and L3, with the highest burden in MSM. It typically shows up as proctocolitis — inflammation of the rectum and colon causing mucoid or bloody rectal discharge, anal pain, and tenesmus (a constant, painful urge to pass stool). LGV needs a longer course of doxycycline than ordinary chlamydia, and recent partners get presumptive treatment CDC, LGV.
When to see a clinician
See a clinician if you have a known exposure, any genital, rectal, or throat symptoms, or a partner who tested positive. Don't wait out the window untreated if symptoms are present. In men, untreated infection can cause epididymitis (inflammation of the coiled tube behind the testicle, which can threaten fertility) and urethritis; read how chlamydial urethritis can lead to painful health complications for men. Treating partners measurably reduces repeat infection NEJM, EPT RCT, so loop them in too.