Chlamydia testing is simple and usually painless. The most common method is a urine sample or a swab, which gets sent to a lab for analysis. Results typically come back within a day. Here’s what to expect depending on where and how you’re tested.
The Standard Test: NAAT
Nearly all chlamydia testing today uses a method called nucleic acid amplification testing, or NAAT. It works by detecting tiny amounts of chlamydia DNA in a sample, then amplifying that genetic material so it can be identified. NAAT catches over 90% of infections while maintaining a specificity of 99% or higher, meaning false positives are rare. It’s the gold standard for chlamydia detection.
The sample itself is either a urine specimen or a swab. Which one you provide depends on your anatomy and where the potential exposure occurred.
What Happens During the Test
For men, the process is almost always a urine test. You urinate into a cup, collecting only the first part of the stream (called a “first-catch” sample). That initial flow carries cells from the urethra, which is where chlamydia lives. For men, first-catch urine performs as well as, and sometimes better than, a urethral swab.
For women, a vaginal swab is the most accurate option. It performs just as well as the cervical swabs that used to require a speculum exam, and many clinics now let you collect the vaginal swab yourself in a private room. A urine test also works for women, though it may detect up to 10% fewer infections compared to a vaginal swab. If you’re given the choice, the swab is more reliable.
If you’ve had oral or anal sex, your provider may also swab your throat or rectum. These are quick and mildly uncomfortable rather than painful. The rectal swab is a short, gentle insertion. Anal lubricants should not be used during collection because they can interfere with the test. Throat swabs feel similar to a strep test.
How to Prepare for a Urine Test
If you’re providing a urine sample, there are a few details that affect accuracy. Don’t urinate for at least 20 minutes before the test. You don’t need to wait for a morning sample or clean your genitals beforehand. When you urinate, collect roughly the first third of your stream into the cup, then pass the rest into the toilet. That first-catch portion contains the most cellular material from the infection site.
When to Get Tested After Exposure
Chlamydia has a short window period compared to many other infections. Testing at one week after exposure catches most infections. Waiting two weeks catches nearly all of them. If you test too soon after a potential exposure, the bacteria may not have replicated enough for even a NAAT to detect.
If you’ve been treated for chlamydia, the CDC recommends retesting about three months later. Reinfection is common, often from an untreated partner. Pregnant women who test positive should have a follow-up test four weeks after treatment, then again in the third trimester.
At-Home Test Kits
Home chlamydia test kits are widely available online and at some pharmacies. They use the same type of lab analysis as clinic tests: you collect a urine sample or a swab at home, mail it to a lab, and receive results electronically. The lab work itself is reliable. The concern is sample collection. Getting an adequate swab or a proper first-catch urine sample takes some care, and errors during collection can lead to false negatives, where an infection is present but goes undetected.
Labs affiliated with hospitals or state health departments tend to have more quality oversight than some direct-to-consumer testing services. If you go the at-home route, follow the collection instructions precisely. If your result is negative but you have symptoms or a known exposure, consider retesting at a clinic.
How Long Results Take
Standard lab-based NAAT results are usually ready within one day. Some clinics and urgent care centers offer rapid point-of-care tests that return results in 90 minutes or less. Home test kits typically take a few additional days because of mailing time.
Who Should Be Screened Routinely
Chlamydia often causes no symptoms at all, which is why routine screening matters. The CDC recommends annual testing for all sexually active women under 25. Women 25 and older should be screened annually if they have a new partner, multiple partners, a partner with other partners, inconsistent condom use outside a monogamous relationship, or a previous STI.
Men who have sex with men should be tested at least once a year at every site of sexual contact (urethra, rectum), regardless of condom use. Those on PrEP, living with HIV, or with multiple partners should test every three to six months. For heterosexual men at low risk, there isn’t a blanket screening recommendation, though testing is reasonable in higher-prevalence settings like STI clinics or correctional facilities.
Transgender and gender-diverse individuals should be screened based on anatomy and sexual practices. Anyone with a cervix who is under 25 and sexually active falls under the same annual screening guideline. Rectal testing should be considered based on reported sexual behaviors. People living with HIV should be screened at their first evaluation and at least annually after that.
Extragenital Testing: Throat and Rectal Swabs
A standard urine test or genital swab won’t detect chlamydia in the throat or rectum. If you’ve had unprotected oral or anal sex, you need to be tested at those specific sites. Rectal and throat chlamydia infections can exist without any genital infection, so a negative urine test doesn’t rule them out.
Extragenital testing is particularly recommended for men who have sex with men, people involved in sex work, known contacts of someone with chlamydia, and anyone with symptoms like rectal pain, discharge, or a persistent sore throat. But even without symptoms, site-specific testing after a relevant exposure is the only way to know.