Gonorrhea and Chlamydia Testing: Understanding Your Report

Section Editor: Rodney E. Rohde PhD
June 4, 2026

Gonorrhea and chlamydia are two common sexually transmitted infections. Gonorrhea is caused by the bacterium Neisseria gonorrhoeae, and chlamydia is caused by the bacterium Chlamydia trachomatis. A bacterium is a microorganism, a living thing too small to see without a microscope. The two are often tested for together, because they cause similar problems and can be checked on the same sample. Both are curable with antibiotics.

This article explains how gonorrhea and chlamydia are tested for, what the wording on your report means, and a few practical points, such as where the sample is taken and when to retest, so you can better understand a report you have received.

What are gonorrhea and chlamydia, and why test for them?

Both infections can affect the genital tract and can also infect the throat, rectum, and eyes. A key point is that both often cause no symptoms at all, especially in women, so a person can have an infection without knowing it. For this reason, testing is done both when there are symptoms and as screening in people who may be at higher risk.

Left untreated, these infections can lead to complications, including pelvic inflammatory disease (an infection of the female reproductive organs) and problems with fertility, and they can be passed to a baby during childbirth. Finding and treating them prevents these problems.

The main test: a molecular (NAAT) test

The standard test is a molecular test, called a nucleic acid amplification test (NAAT), which detects the bacteria’s genetic material, as described in the article on PCR, antigen, and antibody tests. It is very sensitive and very specific, and it usually tests for both gonorrhea and chlamydia at the same time, reporting each one separately.

The sample can be urine, often a first-catch urine sample, or a swab. Swabs may be taken from the vagina, cervix, urethra, rectum, or throat, and in many clinics, the swab can be collected by the patient. One practical point matters here: the test only checks the sampled site. If you may have been exposed at the throat or rectum, a urine sample alone can miss an infection at those sites, and swabs from them are needed.

Other tests: culture and Gram stain

While the NAAT is the main test, two others are used in specific situations:

Culture — Growing the bacteria in the laboratory. For gonorrhea, a culture is mainly used to determine which antibiotics will work, because the bacterium has become resistant to several antibiotics over time, as explained in the article on culture and sensitivity testing. Chlamydia is not usually cultured because it is difficult to grow.
Gram stain — In a man with symptoms such as discharge, a Gram stain of the discharge can give an early clue to gonorrhea.

How to read your result

Each infection is reported separately, so it is possible to be positive for one and negative for the other.

Detected (positive) for gonorrhea, chlamydia, or both — The genetic material of that bacterium was found, which means a current infection.
Not detected (negative) — That bacterium was not found in the sample that was tested. Keep in mind that a negative result reflects only the site that was sampled, and that testing very soon after exposure can miss an early infection.

Timing, retesting, and reinfection

A few points about timing help make sense of these tests. After exposure, it can take a short time for the test to detect an infection, so a test done very early may need to be repeated. After treatment, the molecular test can remain positive for a couple of weeks because it detects residual genetic material. If a test is repeated to confirm that the infection is gone, it is timed to allow for this. And because reinfection is common, retesting a few months after treatment is often recommended, even if you have no symptoms.

What happens after these tests

Gonorrhea and chlamydia testing describes what was found, and it informs the decisions you and your healthcare team make together rather than dictating them on its own.

A positive result is treated with antibiotics in accordance with current treatment guidelines. Because gonorrhea has become resistant to several antibiotics, treatment recommendations are updated over time, and a culture may be used to check which antibiotics will work in certain cases. Partners are usually advised to be tested and treated to prevent reinfection and further spread, and these infections are reportable to public health authorities, who can help with this. In pregnancy, testing and treatment are important to protect the baby.

Questions to ask your doctor

Was I tested for gonorrhea, chlamydia, or both, and what did each result show?
Did the test sample the right sites for my situation, including the throat or rectum if relevant?
Could it have been too soon after exposure for the test to be accurate?
If I tested positive, what does treatment involve, and will it cure the infection?
Could antibiotic resistance affect my gonorrhea treatment?
Should my partner or partners be tested and treated?
Do I need a repeat test to confirm the infection is gone, and when?
When should I be retested to check for reinfection?
If I am pregnant, what does this mean for my baby?
Who should I contact with questions about my results or treatment?