Condition Guide
4 min read

What is "the clap"? Gonorrhoea explained

Written by Mr Stephen Lingam

Reviewed byDr Mohammad Bakhtiar(GMC: 4694470)on 01/10/2026

Key takeaways

  • "The clap" is old slang for gonorrhoea, a bacterial STI; the origin of the word itself is uncertain.
  • Many people, especially women, have no symptoms at all. When symptoms do appear, discharge and pain when urinating are the most common.
  • A gonorrhoea test, on its own or combined with chlamydia, costs £104, with results in 2 to 3 days, or £124 for the FAST version in 6 hours.
  • Gonorrhoea can also infect the throat and rectum, usually without symptoms, so tell the clinician which sites to test.
  • Treatment is an antibiotic injection or course chosen by the doctor, followed by a test of cure 2 weeks later.
  • If you test positive, your current partner should be tested too, so you are not reinfected.

"The clap" is old slang for gonorrhoea, a bacterial STI that can infect the genitals, throat or rectum. Many people notice nothing at all; others get discharge or pain when they urinate. A gonorrhoea test checks for it directly, with results back in 2 to 3 days, or 6 hours on the FAST version.

Next step

Book a gonorrhoea test

Consultation, examination, testing and treatment at our Harley Street clinic. Most results within 24 hours.

Where the name comes from

No one knows for certain where "the clap" comes from. The two explanations most often quoted are the old French word clapier, originally a rabbit hutch and later slang for a brothel, and older slang for the swelling and soreness the infection can cause. Neither is settled fact.

Symptoms in men

In men, gonorrhoea often causes a thick yellow or green discharge from the penis and a burning feeling when urinating. Some men also notice pain or tenderness in the testicles. Others have no symptoms at all, so a test is the only way to be sure either way.

If discharge is what has brought you here, a penile discharge assessment at Medical Express Clinic covers the examination alongside testing.

Symptoms in women

In women, gonorrhoea can cause increased vaginal discharge, pain when urinating, bleeding between periods and lower abdominal pain. Many women, though, have no symptoms whatsoever, which is one reason routine testing after a new partner or unprotected sex matters more than simply waiting to feel unwell.

None of these symptoms are unique to gonorrhoea. They overlap with other infections and with conditions that have nothing to do with sex, so a test rather than symptom-watching is the reliable way to know.

Throat and rectal gonorrhoea

Gonorrhoea can infect the throat after oral sex and the rectum after anal sex, and both are usually symptomless. A urine sample only tests the genital site, so if you've had oral or anal sex, tell the clinician so a throat or rectal swab can check those sites too. Each site is tested separately; a clear genital result doesn't tell you whether the throat or rectum is also infected.

How the test works at our clinic

A gonorrhoea test uses a urine sample or a swab, and it can be combined with a chlamydia test from the same sample, since the two infections often turn up together. If you'd rather cover more ground in one visit, our STI screening packages include the Bronze screen alongside a consultation.

Ways to test for gonorrhoea at 117A Harley Street:

Gonorrhoea test (or combined with chlamydia)
Sample
Urine or swab
Price
£104
Results
2 to 3 days
FAST chlamydia/gonorrhoea
Sample
Urine or swab
Price
£124
Results
6 hours
Throat swab
Sample
Swab, per site
Price
£104 per site
Results
2 to 3 days
Bronze screen
Sample
Urine, swab and blood, with consultation
Price
£250 (HIV, syphilis, chlamydia and gonorrhoea, consultation included)
Results
Bloods about 24 hours; urine and swabs up to 3 days

If you need an answer the same day, FAST testing brings 6-hour gonorrhoea results. Walk in seven days a week at 117A Harley Street when there is capacity, or book online to guarantee a time. No GP referral is needed. Our guide to private STI testing in London explains how a confidential visit works.

Treatment and test of cure

Gonorrhoea is treated by a doctor, with an antibiotic injection or course chosen for you; it isn't something to self-manage or wait out. Because antibiotic resistance is something clinicians watch closely, you're asked to come back for a test of cure 2 weeks after treatment, to confirm it has cleared. Our guide to antibiotic-resistant gonorrhoea has more on why resistance matters.

Telling partners

If you test positive, your current partner, and any recent partners, should be tested too, even if they have no symptoms and feel completely well. Without this, you can be reinfected shortly after finishing your own treatment, and the cycle simply repeats. For more on what either of you might notice, see our guide to gonorrhoea symptoms in men and women.

Whether you've got symptoms or you're testing after a new partner, a gonorrhoea test at 117A Harley Street gives you a clear answer within days, or hours on FAST. Walk in seven days a week, or book online for a guaranteed time.

For confidential testing and treatment, visit our our Harley Street clinic in London. Same-day appointments and walk-ins available.

Next step

Book a gonorrhoea test

Consultation, examination, testing and treatment at our Harley Street clinic. Most results within 24 hours.

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Frequently Asked Questions

Book a gonorrhoea test

Consultation, examination, testing and treatment at our Harley Street clinic. Same-day appointments and walk-ins welcome.

Mon-Fri 9am-6pm, Sat-Sun 10am-2pm. Walk-ins welcome.