Chlamydia Test: Options, Accuracy and Results

By Richard D. Porter, Patient Advocate Updated October 26, 2026

Quick answer

The recommended chlamydia test is a NAAT, which the CDC calls the most sensitive test for detecting the bacteria. It uses a urine sample or a swab, and for people with a vagina a self-collected vaginal swab works as well as one taken by a clinician. Many labs return results within a day or two. The CDC does not give a single waiting time after exposure, so if you test early and get a negative, ask a clinician whether to repeat it.

The test you need

Chlamydia: NAATRetest if negative before day 49

Too earlyMay detect; retest if negativeReliable

Counted from your most recent exposure. CDC gives no single window for chlamydia, gonorrhea, trich or syphilis; the cautious date uses the NHS "up to 7 weeks". Work out your own dates

Test: Chlamydia NAAT (nucleic acid amplification test)
Sample: First-catch urine, or a swab of the vagina, penis (urethra), throat or rectum depending on the sex you had
When: The CDC gives no fixed waiting time after exposure. Ask a clinician, and repeat the test if you test early and it is negative
Results: MedlinePlus says results are usually ready in a day; STDCheck's page says 1 to 2 days

Which of these sound like you?

I am under 25, sexually active, and have a vagina
I am a gay or bisexual man, or a man who has sex with men
I have a new partner, or more than one partner
My partner has been told they have chlamydia
I had oral or anal sex and want those sites checked

The CDC recommends yearly chlamydia screening for sexually active women under 25 and for gay and bisexual men. A partner who has been told they have chlamydia should be evaluated, tested and treated, according to the CDC. This is a guide to the conversation, not a diagnosis.

Chlamydia is a common STI that often has no symptoms, according to the CDC, and MedlinePlus says getting tested is the only way to know for sure. This guide covers the test options, how they work, how reliable they are, and what comes after.

How do you test for chlamydia?

The test the CDC recommends is a NAAT (nucleic acid amplification test). The CDC calls NAATs “the most sensitive tests” for detecting the bacteria. They look for the bacteria’s genetic material in a sample.

The sample depends on your anatomy and the sex you had:

People with a penis. A first-void urine sample or a swab of the urethra.
People with a vagina. A vaginal or cervical swab, or first-void urine. The CDC lists vaginal swabs as an optimal specimen for women.
Throat or rectum. A swab of the site where you had sex. The CDC says infection at these sites can be found by testing the exposure site, and most people with a throat infection have no throat symptoms.

The CDC says patient-collected vaginal swabs are equivalent in sensitivity and specificity to those collected by a clinician. Self-collected rectal swabs are also a reasonable alternative to clinician-collected ones.

How accurate is a chlamydia test?

A NAAT is the most sensitive type of chlamydia test, according to the CDC. No test is perfect, though. For home-collection chlamydia and gonorrhea tests, the FDA names false negatives, which can delay treatment, and false positives, which can lead to unnecessary treatment, as risks. The CDC gives no set waiting time, so a test done very soon after exposure may miss an infection.

Accuracy also depends on following the instructions. For a urine test, MedlinePlus says to avoid urinating for two hours before the sample, and you may need to avoid antibiotics and vaginal creams or douches for 24 hours beforehand. Don’t stop any medicine without asking your clinician.

Who should get a chlamydia test?

The CDC recommends yearly screening for sexually active women under 25 and for gay and bisexual men. For pregnancy, it recommends screening all pregnant women under 25, so ask your prenatal provider whether you should be tested. The CDC says there is insufficient evidence to recommend routine screening of low-risk heterosexual men, but anyone with symptoms or a partner who has been told they have chlamydia should be tested.

When should I test after exposure?

The CDC does not give a single waiting time. STDCheck’s own page says two weeks after exposure is ideal. If you test early and the result is negative, ask a clinician whether to repeat it later. If a partner has been told they have chlamydia, don’t wait for a result to see a clinician. The CDC says recent partners should be evaluated, tested and treated presumptively.

How long do chlamydia test results take?

MedlinePlus says results are usually ready in a day, and some rapid tests give results in 90 minutes or less. STDCheck’s page says results are ready in 1 to 2 days. Home-collection kits are mailed back to a lab, so the total time includes shipping. See how long STD results take for more.

Where can I get a chlamydia test?

You can ask your own healthcare provider, or use a clinic. The CDC’s GetTested locator can help you find testing near you, and it notes that many clinics offer confidential and free or low-cost testing. Check with the location about which tests and sample types it offers.

STDCheck’s own page describes a first-catch urine test, with no swabbing, pricking or undressing, and results in 1 to 2 days. Its page does not mention throat or rectal swabs, so if you had oral or anal sex, ask a clinician about swabbing those sites.

Can I test for chlamydia at home?

Yes, in some forms. The CDC says there are FDA-approved self-collection options for chlamydia, and an FDA-approved self-test using a vaginal swab. See at-home chlamydia test kits. MedlinePlus says not to use an at-home test if you have symptoms or if your partner has chlamydia.

Do I need to retest after treatment?

Yes, in most cases. The CDC says people treated for chlamydia should be retested about 3 months after treatment, even if their partners were also treated. This is mainly to catch a new infection. If you are pregnant, the CDC recommends a test of cure about 4 weeks after you finish treatment. Chlamydia is curable with antibiotics prescribed by a clinician.

Get care now if

You are pregnant and think you may have been exposed, or a test came back positive
You have pelvic or lower belly pain, fever, or pain in the testicles
You have a new discharge or burning when you pass urine that is not going away
A partner has been told they have chlamydia and you have not been treated

Call 911 for a medical emergency. Otherwise, an urgent care clinic, sexual health clinic or your doctor can see you.

When to test

If a partner has been told they have chlamydiaSee a clinician soon. The CDC says recent partners should be evaluated, tested and treated presumptively.
After a possible exposure, with no symptomsThe CDC does not give a set waiting time. A test taken very early can miss an infection, so ask a clinician when to test and whether to repeat it.
Once a year, if you are in a group the CDC recommends screeningSexually active women under 25 and gay and bisexual men are advised to be tested every year.
About 3 months after treatmentThe CDC says people treated for chlamydia should be retested about 3 months later, to catch a new infection.

Common questions

How long does a chlamydia test take?

MedlinePlus says results are usually ready in a day, and some rapid tests give results in 90 minutes or less. STDCheck's page says 1 to 2 days.

Do I need to do anything before a chlamydia urine test?

MedlinePlus says to avoid urinating for two hours before a first-catch urine sample. Follow whatever instructions your clinic or lab gives you, since they can differ.

Can a chlamydia test be wrong?

Any test can miss an infection. For home-collection tests, the FDA notes that false negatives can delay treatment, so if you have symptoms or a recent exposure, talk to a clinician even after a negative result.

Does a negative test mean I am clear for good?

No. MedlinePlus says a negative result means chlamydia was not found when the sample was taken. A new exposure afterward would need a new test.

Next: Chlamydia NAAT (nucleic acid amplification test).

First-catch urine, or a swab of the vagina, penis (urethra), throat or rectum depending on the sex you had. The CDC gives no fixed waiting time after exposure. Ask a clinician, and repeat the test if you test early and it is negative

Sources

This guide is general information written by a patient advocate using public health sources. It is not a diagnosis. Only a clinician or a lab test can tell you whether you have an infection. Read how we write and check our guides.