Lab result explainedInflammationLast updated November 11, 2026

Gonorrhea test: how you test for gonorrhea (urine, swab, throat), how accurate it is, and what positive and negative results mean

Gonorrhea test · Chlamydia trachomatis / Neisseria gonorrhoeae NAAT (CT/NG), urine or swab; culture when susceptibility testing is needed · reported in Qualitative: negative (not detected) or positive (detected), with 'equivocal' or 'invalid' on some reports; culture additionally reports antibiotic susceptibility

A gonorrhea test looks for Neisseria gonorrhoeae, the bacterium behind the second most commonly reported bacterial sexually transmitted infection in the United States, with about 600,000 cases reported a year. The standard test is a nucleic acid amplification test (NAAT) that detects the organism's DNA or RNA in first-catch urine or a swab from the vagina, cervix, urethra, throat or rectum, almost always run together with the chlamydia test on the same sample. It is reported as negative (not detected) or positive (detected).

NAATs detect more than 95 percent of genital infections (self-collected vaginal swabs and male urine are the best samples; female urine is somewhat less sensitive) and over 90 percent of throat and rectal infections, with a specificity above 99 percent. Because gonorrhea in the throat and rectum is almost always silent, and because about half of infected women have no symptoms, the site you swab matters as much as the test: a urine sample cannot find a throat infection.

Gonorrhea is treated with a single injection of ceftriaxone, but it is the one common STI where antibiotic resistance is a live problem, which is why laboratories still keep culture available: only a cultured organism can be tested for antibiotic susceptibility when treatment fails. Throat infections are the hardest to clear and are the one site where a repeat test 1 to 2 weeks after treatment is routinely recommended. Everyone is retested at 3 months for reinfection.

Gonorrhea test at a glance

  • What it is: a NAAT (PCR-type test) for Neisseria gonorrhoeae in first-catch urine or a swab from the vagina, cervix, urethra, throat or rectum; usually combined with the chlamydia test.
  • Normal: negative (not detected). Reliable if collected at least 1 to 2 weeks after the last possible exposure and from every site that was exposed.
  • Positive: gonorrhea is present at that site. It is treated with a single injection of ceftriaxone (500 mg, or 1 g over 150 kg body weight under CDC 2021 guidelines), partners from the last 60 days are treated, and sex is avoided for 7 days after treatment.
  • Accuracy: sensitivity over 95 percent for genital samples and over 90 percent for throat and rectum, specificity above 99 percent. Urine must be first-catch; a male urine test is as good as a swab, a female urine test is a little less sensitive than a vaginal swab.
  • How long results take: 1 to 3 days from a laboratory, 30 to 90 minutes with a point-of-care NAAT; culture takes 2 to 3 days plus 1 to 2 more for susceptibility results.
  • After treatment: throat infections are retested at 7 to 14 days; genital and rectal infections are not routinely retested unless symptoms persist, and a NAAT can stay positive for up to 2 weeks. Everyone retests at 3 months.

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What Gonorrhea test measures

A NAAT amplifies a DNA or RNA sequence specific to Neisseria gonorrhoeae until it is detectable, so a sample containing only a few organisms tests positive. It detects dead as well as live bacteria, which is why a test within 1 to 2 weeks of treatment can be positive without live infection. The major commercial assays (Aptima Combo 2, cobas CT/NG, BD) test for chlamydia and gonorrhea simultaneously, and all are FDA-cleared for throat and rectal swabs as well as urine, vaginal, cervical and urethral samples.

Older methods still have specific roles. A Gram stain of urethral discharge in a man with symptoms shows the typical bean-shaped bacteria inside white cells and is more than 95 percent sensitive and 99 percent specific, giving an answer in minutes; it is unreliable for women, the throat and the rectum, and for men without symptoms. Culture on selective media detects 85 to 95 percent of genital infections when the swab is transported properly and far fewer at the throat, but it is the only method that yields a living organism for antibiotic susceptibility testing, so it is used whenever treatment fails or resistance is suspected.

Sample choice determines what you find. In women a vaginal swab (self-collected is as good as clinician-collected) is the most sensitive sample and first-catch urine the least; in men first-catch urine, the first 20 to 30 mL after at least an hour without urinating, matches a urethral swab. Throat gonorrhea is more than 90 percent asymptomatic, rectal gonorrhea mostly so, and a third or more of infections in men who have sex with men are at those sites only, so three-site testing is standard for anyone with oral or receptive anal exposure. Symptoms in men start 2 to 7 days after exposure; a NAAT turns positive within days, and 1 to 2 weeks after exposure is the usual testing point.

Normal range for Gonorrhea test

Reference ranges vary between labs and by age, sex and pregnancy. Use the range printed on your own report.

GroupTypical range (Qualitative: negative (not detected) or positive (detected), with 'equivocal' or 'invalid' on some reports; culture additionally reports antibiotic susceptibility)Notes
Negative, collected 2 or more weeks after the last possible exposureNot detectedReliable negative for the site sampled. Repeat after any new exposure or at routine screening (every 3 to 12 months depending on risk).
Negative, collected within the first week of exposureNot detectedNot fully conclusive; repeat at 2 weeks or sooner if discharge or burning develops. Male urethral symptoms usually appear within 2 to 7 days.
Positive, genital (urine, vaginal, cervical or urethral)DetectedGonorrhea infection. Treated with ceftriaxone the same day; partners from the previous 60 days are treated; retest at 3 months.
Positive, throat (pharyngeal)DetectedThe hardest site to clear and a reservoir for resistance. A repeat NAAT or culture 7 to 14 days after treatment is recommended; a persistent positive is cultured for susceptibility.
Positive, rectalDetectedUsually asymptomatic. Treated the same way as genital infection; in women often present alongside genital infection without anal sex.
Positive within 2 weeks of treatment, no symptomsDetectedOften residual DNA from dead organisms. If a retest is needed before 2 weeks, culture is preferred; otherwise repeat the NAAT after 14 days.
Positive with persistent symptoms after treatmentDetectedPossible treatment failure or reinfection. Culture with susceptibility testing before retreating, and the case is reported for resistance surveillance.
Gram stain of urethral discharge (symptomatic men)Gram-negative intracellular diplococci seen or not seenPositive stain is diagnostic and allows immediate treatment; a negative stain in a man with discharge still needs a NAAT.

Positive gonorrhea test

A positive result means Neisseria gonorrhoeae was detected at the site sampled. Specificity is above 99 percent, so in anyone who has had sex a positive is a true infection, with or without symptoms. Gonorrhea is reportable, and the health department can help notify partners confidentially. Because 10 to 40 percent of people with gonorrhea also have chlamydia, the CDC recommends treating for chlamydia as well unless a chlamydia test from the same sample is negative.

Treatment is a single intramuscular injection of ceftriaxone, 500 mg (1 g for people over 150 kg), which clears well over 95 percent of genital and rectal infections and about 90 to 95 percent of throat infections. Untreated, gonorrhea ascends in 10 to 20 percent of women to cause pelvic inflammatory disease, with its risks of tubal infertility, ectopic pregnancy and chronic pelvic pain; in men it causes epididymitis; and in 0.5 to 3 percent of people it spreads through the blood (disseminated gonococcal infection) to cause fever, joint pain and a pustular rash. It also roughly doubles to triples the risk of acquiring HIV.

Resistance is why gonorrhea testing differs from chlamydia testing. Ciprofloxacin, penicillin, tetracycline and increasingly azithromycin no longer work reliably, and strains with reduced ceftriaxone susceptibility have been reported in the United States. A positive NAAT does not tell you which antibiotics will work; if symptoms persist after treatment, a culture is taken before any retreatment so the organism can be tested, and the case is reported to the CDC's resistance surveillance program. Abstain from sex for 7 days after treatment and until partners are treated.

Common causes

  1. Current genital infection from vaginal or anal sex

    The usual reason. Transmission from an infected partner is efficient: an estimated 50 to 70 percent per act from man to woman and 20 to 30 percent from woman to man, higher with repeated exposure.

  2. Throat (pharyngeal) infection from oral sex

    More than 90 percent asymptomatic and found only by a throat swab. It is the most common site in men who have sex with men, the hardest to clear, and the place where resistance tends to develop, because the bacteria exchange genes with harmless Neisseria species in the throat.

  3. Rectal infection

    From receptive anal sex, and in women also by spread from genital secretions. Usually asymptomatic; occasionally causes pain, discharge, bleeding or urgency (proctitis).

  4. Reinfection from an untreated or new partner

    Around 1 in 8 to 1 in 10 people test positive again within a year, usually within 3 to 6 months. It is the main reason for a second positive and for the recommended 3-month retest.

  5. Residual DNA shortly after treatment

    NAATs detect dead organisms; gonococcal DNA usually clears within a week but can be detectable for up to 2 weeks, so a test in that window may be positive without live infection.

  6. Treatment failure from a resistant strain

    Uncommon in the United States with ceftriaxone, but recognized in throat infections and with strains imported from Asia and Europe. Persistent symptoms after treatment, or a positive throat retest, trigger culture and susceptibility testing.

  7. Eye infection (conjunctivitis)

    From infected secretions reaching the eye in adults, or during birth in newborns. Produces a profuse pus-like discharge and can damage the cornea within days; it is a same-day emergency.

  8. False positive

    Rare with current assays (specificity above 99 percent). Some older throat tests cross-reacted with harmless Neisseria species; current FDA-cleared assays do not to any meaningful degree. A positive in someone with no plausible exposure is repeated on a fresh sample, ideally with a different assay or culture.

Symptoms that can go with it

  • None in about half of women, in most throat and rectal infections, and in around 1 in 10 men with urethral infection
  • In men: thick yellow, green or white discharge from the penis, burning on urination and sometimes painful or swollen testicles, typically 2 to 7 days after exposure
  • In women: increased or discolored vaginal discharge, burning on urination, bleeding between periods or after sex, lower abdominal pain
  • Throat: usually none; occasionally a sore throat or swollen neck glands
  • Rectum: discharge, itching, soreness, bleeding or painful bowel movements, or nothing at all
  • Eyes: red, painful eyes with heavy pus discharge
  • Spread through the blood: fever, chills, painful swollen joints (often the wrist, ankle or knee), tendon pain and scattered pustules on the skin

Negative gonorrhea test

A negative result means no Neisseria gonorrhoeae genetic material was found in the sample you gave. Provided the sample came from the site that was exposed and was collected at least 1 to 2 weeks after the last possible exposure, you can be confident you do not have gonorrhea there: a NAAT misses fewer than 5 percent of genital infections and under 10 percent of throat and rectal infections. A negative urine test says nothing about the throat or rectum, and a negative in one partner does not clear the other.

Symptoms that persist with a negative gonorrhea test usually have another cause: chlamydia (tested on the same sample), Mycoplasma genitalium, trichomoniasis, a urinary tract infection, herpes, bacterial vaginosis or non-infectious urethritis. Retesting is recommended every 3 to 12 months for anyone with new or multiple partners, every 3 months for people on HIV PrEP, and after any new exposure.

Common causes

  1. No infection

    The expected result; gonorrhea prevalence in people screened in primary care is typically under 1 to 2 percent, higher in STI clinics and in people with symptoms.

  2. Tested too early

    The bacteria need a few days to multiply; a test in the first few days after exposure can be negative. Repeat at 2 weeks or when symptoms appear.

  3. Wrong site sampled

    Urine and vaginal samples cannot detect throat or rectal infection, which account for a third or more of infections in men who have sex with men and a meaningful share in women.

  4. Midstream or recently voided urine

    Gonococci are concentrated in the first part of the urine stream; midstream urine or a sample given within an hour of urinating lowers sensitivity, more so in women.

  5. Culture rather than NAAT used at the throat or rectum

    Culture detects only 40 to 70 percent of infections at those sites, so a negative culture there is weak evidence; a NAAT should be used for screening and culture reserved for susceptibility testing.

Symptoms that can go with it

  • None; a negative result is the expected finding
  • Discharge, burning or pelvic pain that continues despite a negative test needs testing for chlamydia, Mycoplasma genitalium, trichomoniasis and urinary infection

Read it alongside

  • Chlamydia NAAT — run on the same sample; co-infection is common enough that chlamydia is treated presumptively when gonorrhea is positive and the chlamydia result is not available.
  • Gonorrhea culture with antibiotic susceptibility — ordered when symptoms persist after treatment or a throat retest is positive, because only culture can show which antibiotics work.
  • HIV antigen/antibody test — recommended at every gonorrhea diagnosis; gonorrhea increases HIV acquisition and transmission.
  • Syphilis screen (RPR or treponemal antibody) — part of the standard panel; syphilis rates track with gonorrhea in the same populations.
  • Mycoplasma genitalium NAAT — considered for urethritis or cervicitis that persists after gonorrhea and chlamydia have been treated or excluded.
  • Trichomonas vaginalis NAAT — a frequent cause of similar discharge in women, not included on a CT/NG test unless requested.
  • Hepatitis B surface antigen and hepatitis C antibody — baseline for people with a new STI, with vaccination offered to the hepatitis B non-immune.
  • Urinalysis and urine culture — leukocytes with a negative urine culture (sterile pyuria) points to gonorrhea or chlamydia rather than a bladder infection.

What usually happens next

  1. A positive result is treated the same day with a ceftriaxone injection; if the chlamydia result from the same sample is not yet known or is positive, a course of doxycycline is added. Tell the clinician about cephalosporin or penicillin allergy, since an alternative regimen is needed.
  2. Partners from the previous 60 days are notified, tested and treated regardless of their result; the health department can do this anonymously. Avoid sex for 7 days after treatment and until all partners have been treated.
  3. Throat infection: book a repeat test (NAAT or culture) 7 to 14 days after treatment. Genital or rectal infection: no routine retest unless symptoms persist, in which case a culture is taken before any further antibiotics.
  4. Complete the STI panel if it was not done: HIV, syphilis, throat and rectal swabs if those sites were exposed, trichomoniasis in women, and hepatitis B and C.
  5. Retest at 3 months, whatever the partner situation, because around 1 in 10 people are reinfected within a year. People on PrEP or with multiple partners are tested every 3 months anyway.
  6. A negative result with ongoing symptoms is followed by tests for chlamydia, Mycoplasma genitalium, trichomoniasis, urinary infection and herpes rather than by repeating the gonorrhea test.

Diet, lifestyle and natural levers with evidence

What can move Gonorrhea test once the cause is known. Nothing here replaces finding the cause.

Swab every site that was exposed, and time the test correctly

Strong evidence

Nothing dietary changes a gonorrhea result; the sample does. In studies of men who have sex with men, urine-only testing missed around 70 to 80 percent of all gonorrhea infections because they were in the throat or rectum, and in women a vaginal swab detects several percentage points more infections than urine. Testing at 1 to 2 weeks after exposure, with first-catch urine after at least an hour without urinating, avoids the early false negative.

Partner treatment and a 3-month retest

Strong evidence

In a randomized trial of expedited partner therapy, giving patients treatment to pass to partners reduced persistent or recurrent gonorrhea by about two-thirds (3 percent versus 11 percent among those with gonorrhea), a larger effect than for chlamydia. A systematic review found repeat gonorrhea in about 1 in 8 women within a year, which is why the 3-month retest is recommended regardless of symptoms.

Consistent condom use

Moderate evidence

Gonorrhea is transmitted through infected secretions, so a condom covers the route. Observational studies that account for actual exposure to an infected partner find consistent use reduces gonorrhea acquisition by roughly 60 to 90 percent, and the protection is lost with inconsistent use or late application. Condoms do not protect the throat during oral sex unless used there too.

Doxycycline post-exposure prophylaxis (doxy-PEP), for specific groups

Strong evidence

In a randomized trial of 501 men who have sex with men and transgender women on PrEP or living with HIV, 200 mg of doxycycline within 72 hours after condomless sex reduced new gonorrhea by about 55 percent and chlamydia and syphilis by 70 to 80 percent per quarter; the CDC issued guidance supporting it for this group in 2024. A trial in cisgender women in Kenya found no reduction, probably because of low adherence, so it is not currently recommended for women.

A prescription medicine, not a supplement; it raises concern about tetracycline resistance in gonorrhea and other bacteria and causes sun sensitivity. It does not replace testing every 3 months.

Nothing you can take or gargle clears gonorrhea

Strong evidence

A randomized trial of 343 men found that daily antiseptic mouthwash did not reduce throat gonorrhea compared with a control rinse, despite earlier laboratory and pilot data suggesting it might. No herb, probiotic, garlic, silver or vitamin product has any evidence of clearing Neisseria gonorrhoeae, and untreated infection can persist for months while causing silent damage. Ceftriaxone clears over 95 percent of infections with one injection.

Colloidal silver products marketed for infections cause permanent skin discoloration and have no effect on gonorrhea.

When to see a clinician promptly

  • Fever with painful, swollen joints, tendon pain or scattered pustules on the skin after a possible exposure: disseminated gonococcal infection needs same-day assessment and usually intravenous antibiotics.
  • A red, painful eye with heavy pus discharge in anyone, and especially in a newborn: gonococcal conjunctivitis can perforate the cornea within days.
  • Lower abdominal or pelvic pain with fever or pain during sex alongside a positive test or known exposure: possible pelvic inflammatory disease, treated the same day to protect fertility.
  • Sudden severe testicular pain or swelling: epididymitis is treated urgently, and torsion, which can mimic it, is a surgical emergency.
  • Symptoms that persist or return after a ceftriaxone injection, or a positive throat retest: culture and susceptibility testing before any further antibiotics.
  • A positive test in pregnancy, or a pregnant partner of someone who tests positive: treatment prevents transmission at birth.

Frequently asked questions

How do you test for gonorrhea?

With a NAAT on a sample from each site that was exposed: first-catch urine or a urethral swab in men, a self-collected or clinician-collected vaginal swab (or urine) in women, and a throat swab or rectal swab for oral or receptive anal exposure. In a man with discharge, a Gram stain of the discharge can confirm gonorrhea in minutes. Culture is added when treatment has failed, to test which antibiotics work. There is no blood test for gonorrhea.

How soon after exposure can you test for gonorrhea?

A NAAT can be positive within a few days of exposure, and men with urethral infection usually develop symptoms within 2 to 7 days. For a reliable negative, test 1 to 2 weeks after the exposure; if you test earlier and the result is negative, repeat it at 2 weeks. Throat and rectal infections rarely cause symptoms, so timing matters more there because symptoms will not prompt a recheck.

How long do gonorrhea test results take?

Laboratory NAAT results usually take 1 to 3 business days. Point-of-care NAATs in some clinics give results in 30 to 90 minutes, and a Gram stain of urethral discharge gives an answer in minutes. Culture takes 2 to 3 days to grow the organism and another 1 to 2 days for antibiotic susceptibility results. Mailed home-collection kits take about a week including shipping.

Can you test for gonorrhea in the throat?

Yes, with a throat swab tested by NAAT, which is FDA-cleared for the major assays and can be self-collected. A urine or vaginal test will not detect throat gonorrhea. Throat infection causes no symptoms in more than 90 percent of cases, is the most common site in men who have sex with men, and is the hardest site to clear, which is why a repeat throat test 7 to 14 days after treatment is recommended.

Can a gonorrhea test be wrong?

Rarely. NAATs have a specificity above 99 percent, so false positives are uncommon, mainly within 2 weeks of treatment when dead bacterial DNA is still detectable. False negatives come from testing in the first few days after exposure, sampling the wrong site (urine when the infection is in the throat or rectum), midstream rather than first-catch urine, or using culture instead of NAAT at the throat. The test itself misses fewer than 5 percent of genital infections.

Why is my gonorrhea test still positive after treatment?

If the retest was within 2 weeks of treatment and you have no symptoms, it is most likely residual DNA from dead organisms; repeat after 14 days. If you have symptoms, the likely explanations are reinfection from an untreated partner or, less often, a resistant strain, particularly in the throat. In that case a culture is taken before any further antibiotics so the organism can be tested, and the case is reported for resistance surveillance.

Does a gonorrhea test also check for chlamydia?

Almost always. Laboratories run both on the same urine or swab sample as a combined CT/NG test, and the results are reported together. Trichomoniasis, Mycoplasma genitalium, HIV, syphilis and herpes are separate tests and have to be requested; a full STI check includes HIV and syphilis blood tests alongside the CT/NG test, plus throat and rectal swabs where relevant.

Can gonorrhea go away on its own?

Not reliably, and not safely. Some infections, particularly in the throat, clear spontaneously over weeks to months, but genital infections commonly persist and continue to be transmissible, and the risk of pelvic inflammatory disease, epididymitis and disseminated infection accumulates while you wait. A single ceftriaxone injection clears more than 95 percent of infections, so there is no reason to wait.

References

  1. Gonorrhea test. MedlinePlus, US National Library of Medicine (2024)View source
  2. Workowski KA, Bachmann LH, Chan PA, et al.. Sexually transmitted infections treatment guidelines, 2021. MMWR Recommendations and Reports (2021)
  3. St. Cyr S, Barbee L, Workowski KA, et al.. Update to CDC's treatment guidelines for gonococcal infection, 2020. MMWR Morbidity and Mortality Weekly Report (2020)
  4. Papp JR, Schachter J, Gaydos CA, Van Der Pol B. Recommendations for the laboratory-based detection of Chlamydia trachomatis and Neisseria gonorrhoeae — 2014. MMWR Recommendations and Reports (2014)
  5. US Preventive Services Task Force. Screening for chlamydia and gonorrhea: US Preventive Services Task Force recommendation statement. JAMA (2021)
  6. Golden MR, Whittington WL, Handsfield HH, et al.. Effect of expedited treatment of sex partners on recurrent or persistent gonorrhea or chlamydial infection. New England Journal of Medicine (2005)
  7. Luetkemeyer AF, Donnell D, Dombrowski JC, et al.. Postexposure doxycycline to prevent bacterial sexually transmitted infections. New England Journal of Medicine (2023)
  8. Bachmann LH, Barbee LA, Chan P, et al.. CDC clinical guidelines on the use of doxycycline postexposure prophylaxis for bacterial sexually transmitted infection prevention, United States, 2024. MMWR Recommendations and Reports (2024)
  9. Chow EPF, Williamson DA, Hocking JS, et al.. Antiseptic mouthwash for gonorrhoea prevention (OMEGA): a randomised, double-blind, parallel-group, multicentre trial. The Lancet Infectious Diseases (2021)
  10. Unemo M, Shafer WM. Antimicrobial resistance in Neisseria gonorrhoeae in the 21st century: past, evolution, and future. Clinical Microbiology Reviews (2014)
  11. Hosenfeld CB, Workowski KA, Berman S, et al.. Repeat infection with chlamydia and gonorrhea among females: a systematic review of the literature. Sexually Transmitted Diseases (2009)
  12. Gonorrhea. Merck Manual Professional Version (2024)

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