Chlamydia and Gonorrhea Testing

What these tests measure

Chlamydia and gonorrhea testing looks for evidence of two different bacteria: Chlamydia trachomatis and Neisseria gonorrhoeae. These organisms can infect the same parts of the body, including the genital tract, rectum, and throat, so clinicians often check for both at the same time.

Most tests use nucleic acid amplification, a laboratory method that detects the genetic material of the bacteria. A urine sample is the most common specimen for genital screening. Some panels also test a swab from the throat or rectum when a person's history suggests those sites may be involved.

Blood testing is sometimes ordered alongside urine testing. A blood sample can be used to look for other infections, such as syphilis or HIV, that are often screened for at the same visit. Blood testing alone is not the usual way to detect chlamydia or gonorrhea.

Why someone might order testing

Because these infections often produce no symptoms, many people order testing without feeling unwell. Screening is a way to check for infection after a possible exposure or simply as part of routine sexual health care.

• No symptoms, but a recent new partner or change in partners
• Discharge, burning with urination, or pelvic or testicular discomfort
• A partner has been told they have an infection
• Routine screening as part of preventive sexual health care

Testing does not tell you when an infection was acquired, and it does not replace an evaluation for symptoms that concern you. If you have pain, fever, or other symptoms, a healthcare provider can help.

How samples are collected

For a urine test, you provide a first-catch urine sample, meaning the first part of the stream, in a private restroom at a collection site. Collecting the sample this way helps the laboratory detect bacteria that may be present in the urethra.

For a swab test, a healthcare professional collects a sample from the area being tested. Swabs are quick and generally not painful. The collection method is chosen based on the site being screened and the test that was ordered.

Samples are sent to a laboratory for analysis, and results are reported back, usually within a few business days. Timing depends on the test ordered and the laboratory's processing schedule.

What a result can and cannot tell you

A negative result means the laboratory did not detect the bacteria in the sample that was tested. It does not guarantee that no infection is present. If the sample was collected too soon after an exposure, the test may not yet detect an infection.

A positive result means the bacteria's genetic material was found. A positive result is not a diagnosis on its own. It is information your healthcare provider uses, along with your history and any symptoms, to decide what comes next.

Results apply only to the site that was sampled. A urine test does not tell you about a throat or rectal infection, and a swab from one site does not describe another. This is one reason a provider may recommend more than one sample.

Factors that can affect results

• Timing: testing too soon after an exposure may miss an infection
• Sample quality: a poorly collected urine sample can reduce accuracy
• Antibiotics taken recently may affect what the laboratory detects
• Site of collection: urine and swab tests answer different questions

Tell the ordering provider about any medications you are taking and about the timing of possible exposures. That information helps the laboratory and your provider interpret the result correctly.

How self-pay ordering works

With self-pay testing, you choose the panel you want, order it online, and pay for it directly rather than through insurance. You then visit a collection site to provide your sample. Results are returned to you through a secure online account.

Self-pay testing is confidential and does not generate an insurance claim. You decide who sees the results and whether to share them with a healthcare provider. Many people appreciate the privacy and the ability to order testing on their own schedule.

These tests screen for infection; they do not treat it. If a result is positive or unclear, review it with a qualified healthcare provider who can explain what it means and discuss appropriate next steps.