Gonorrhea is diagnosed primarily through a simple lab test that detects the bacteria’s genetic material in a urine sample or swab. The most common and accurate method, called a nucleic acid amplification test, catches about 99% of infections and can be run on samples from the genitals, throat, or rectum. Most people get results within a few days, though newer rapid tests can deliver answers in under 30 minutes.
The Standard Test: Genetic Detection
The go-to diagnostic tool works by amplifying tiny traces of bacterial DNA in your sample so they can be detected. This type of test has a sensitivity of 98.7% and a specificity of 100%, meaning it catches nearly every true infection and virtually never flags a false positive. It replaced older methods as the standard because it’s more accurate, works on a wider range of sample types, and doesn’t require live bacteria to produce a result.
Bacterial culture, the older method where a lab grows the bacteria from your sample, is less sensitive at around 86%. It misses roughly one in seven infections. Culture does still play an important role, though: it’s the only routine method that lets labs test which antibiotics the bacteria respond to. With drug-resistant gonorrhea becoming a growing concern, your provider may order a culture alongside the genetic test, especially if your initial treatment doesn’t clear the infection.
What Samples Are Collected
The type of sample depends on where the infection might be and your anatomy. For most people, testing starts with one of two options: a urine sample or a swab.
- Urine sample: You provide the first part of your urine stream (not midstream) in a sterile cup. For the most accurate result, you should avoid urinating for at least one hour before collection. This method works well for detecting genital infections and is the least invasive option.
- Vaginal swab: A swab of the vaginal wall, which you can often collect yourself in a private room. Self-collected vaginal swabs perform nearly identically to samples taken by a clinician during a pelvic exam.
- Urethral swab: Less common now that urine testing is available, but sometimes used in men with visible discharge. A thin swab is inserted briefly into the opening of the urethra.
- Rectal or throat swab: Necessary if you’ve had receptive anal or oral sex, since urine tests won’t detect infections at those sites. A swab is gently rotated in the rectum or across the back of the throat.
A few practical details matter for accurate results. Vaginal lubricants, speculum gels, and anal lubricants can interfere with the test and should be avoided before sample collection. Over-the-counter hygiene products used in the rectum or throat can also cause problems. If any of these products were used, the lab may cancel the specimen and ask for a new one.
Extragenital Testing: Throat and Rectum
Gonorrhea in the throat or rectum often causes no symptoms at all, which means it can easily go undetected if only a urine test is done. These infections are still transmissible and, if left untreated, can silently pass between partners. That’s why testing at every site of sexual exposure matters.
The CDC recommends at least yearly screening at all relevant anatomical sites for men who have sex with men, based on the types of sexual contact they’ve had in the past year. For those with multiple or anonymous partners, or those who use certain substances in conjunction with sex, screening every 3 to 6 months is recommended. Throat and rectal swabs use the same genetic detection technology as genital testing and are equally reliable.
Gram Stain for Symptomatic Men
If you’re a man with visible urethral discharge, a provider can sometimes get a preliminary answer in minutes using a microscope. A sample of the discharge is spread on a glass slide, stained, and examined. In symptomatic men, this approach is 90% to 98% sensitive and 95% to 98% specific, making it a useful rapid screen in clinical settings. In men without symptoms, however, the sensitivity drops to around 60%, so it’s not reliable for routine screening. This method is also not recommended for diagnosing infections in women or at non-genital sites, where results are far less accurate.
Rapid Point-of-Care Tests
A newer generation of rapid tests can detect gonorrhea, chlamydia, and trichomoniasis from a self-collected swab with results in under 30 minutes. These tests use the same core technology as standard lab-based genetic testing and report about 97% accuracy. They’ve been FDA-approved for rapid testing in women, with approval for men still pending. Availability is limited for now, mostly offered at certain urgent care locations, but the technology is expanding.
Home Test Kits
At-home gonorrhea test kits let you collect your own sample (typically a vaginal swab or urine) and mail it to a lab. The lab runs the same genetic detection test used in clinics, so accuracy is comparable. In one study, results from self-obtained vaginal swabs were nearly identical to clinician-collected samples, with only 2% of home specimens coming back as unsatisfactory.
Home testing also appears to increase follow-through. Research found that women who chose home-based testing were roughly three times more likely to actually complete the test compared to those assigned to clinic-based testing. If you have difficulty accessing a clinic due to scheduling, transportation, or privacy concerns, a home kit is a reliable alternative. Just make sure the kit you choose uses an accredited lab and covers all the anatomical sites relevant to your sexual history, since many kits only test genital samples and would miss throat or rectal infections.
Why You’re Tested for Chlamydia Too
Nearly every gonorrhea test is paired with a chlamydia test, often on the same sample in a single combined panel. Co-infections are common enough that testing for one without the other risks missing a second active infection. The two bacteria cause similar symptoms (or no symptoms at all), affect the same anatomical sites, and are treated with different antibiotics. Running both tests simultaneously costs the same and uses the same specimen, so there’s no reason to skip it.
Who Should Be Screened
Screening is recommended even when you feel fine, because gonorrhea frequently produces no symptoms, particularly in women and at non-genital sites. The U.S. Preventive Services Task Force recommends gonorrhea screening for all sexually active women 24 and younger. For women 25 and older, screening is recommended if risk factors are present: a new sex partner, more than one partner, a partner with concurrent partners, a partner with an STI, inconsistent condom use outside a mutually monogamous relationship, a previous STI, or a history of exchanging sex for money or drugs.
Pregnant women under 25 should be screened at their first prenatal visit. Older pregnant women with risk factors should be screened then too, and again in the third trimester if risk remains elevated. For men who have sex with men, the CDC recommends annual screening at minimum, with more frequent testing for those at higher risk. For other men, evidence on routine screening is less clear, but testing is appropriate whenever symptoms appear or a partner tests positive.
What Happens After a Positive Result
If your test comes back positive, treatment is straightforward and typically involves a single dose of antibiotics given as an injection. Because drug-resistant strains of gonorrhea are increasingly common worldwide, your provider may request a follow-up culture to confirm the bacteria respond to the chosen antibiotic. A test-of-cure, meaning a repeat test to confirm the infection has cleared, is generally recommended about two weeks after treatment. Retesting three months later is also advised, since reinfection rates are high, especially if your sexual partners weren’t treated at the same time.