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Extragenital testing is the difference between a screening that works and one that produces a clean result while an infection sits untouched. A blood test and a urine sample feel thorough. For men who have sex with men they are not, because the majority of gonorrhoea and chlamydia is not in the urethra. It is in the throat and the rectum, it rarely announces itself, and a urine pot cannot reach it.
What extragenital testing actually is
Three sites, not one
Extragenital testing means swabs taken from the throat and the rectum alongside the urine sample, and it is what the guidelines have asked for since 2021. The CDC recommends that chlamydia and gonorrhoea screening, including pharyngeal or rectal testing, be offered at least annually on the basis of sexual behaviour and the anatomic site of exposure. Syphilis and HIV stay on blood. The swabs are for the two infections that hide.
Where the infections actually sit
A CDC analysis of 139,718 screening visits by men who have sex with men found gonorrhoea in 11.8% of rectal and 9.1% of pharyngeal samples against 7.5% urethral, and chlamydia in 12.6% rectal against 5.2% urethral. The rectum and the throat are not secondary sites. On these numbers they are the main ones.
What a urine-only test misses
Over 70% of gonorrhoea, 85% of chlamydia
The figure that should end the debate comes from a study of 21,994 men who have sex with men: more than 70% of extragenital gonorrhoea and 85% of extragenital chlamydia were associated with a negative urethral test. Without extragenital testing, those infections are not merely undiagnosed, they are actively reassured. Someone walks out with a negative result and keeps transmitting.
Most of it has no symptoms
This is why the gap persists. Rectal and pharyngeal gonorrhoea and chlamydia are usually silent, which means nothing prompts a visit and nothing suggests to a clinician that a swab is needed. Waiting for a symptom is not a screening strategy for these two infections, it is how they spread. The only thing that finds them is testing the site.
How often, and when a test is too early
At least annually, more if the calendar is busy
The baseline is annual. It moves up with the number of partners, and anyone on PrEP is already screened at every renewal visit, which builds the rhythm in. Extragenital testing has to be part of every one of those rounds rather than an occasional extra, because the sites do not take turns.
Window periods
A test taken too soon is worse than no test, because it comes back negative and gets believed. A laboratory antigen/antibody HIV test needs 45 days to detect 99% of infections, and UK guidance treats a negative at six weeks as conclusive without confirmation. Rapid finger-prick tests need up to 90 days for the same certainty and a positive always needs confirming. After a specific exposure, the French guidance sets the calendar at six weeks without treatment, ten weeks after a course of post-exposure prophylaxis, and twelve where there is a hepatitis risk, so that late hepatitis B and C markers are not missed, as covered in the article on the HIV PEP window.
What a negative result actually means
A photograph, not a guarantee
A negative result describes the day the samples were taken, minus the window periods behind them. It says nothing about the week since. Extragenital testing narrows the blind spot considerably, because it stops leaving two entire sites out of the picture, but it does not abolish it. That is an argument for testing on a rhythm rather than only after a scare, and for treating a recent negative as information rather than as a permanent status.
Telling partners is part of the test
A positive throat or rectal swab is not a private matter, because the people it came from and the people it went to are untested and mostly without symptoms. Clinics can notify partners anonymously in most countries, and going through them removes the conversation nobody wants to have. It is the only mechanism that breaks the loop: extragenital testing finds infections that would otherwise circulate indefinitely, and that only helps if the finding travels.
Doing the swabs
Self-swabs at home work
Anyone put off by the idea of a clinician doing this can stop worrying. In a study of 296 people and 1,032 swabs, at-home self-collected pharyngeal and rectal swabs reached 100% sensitivity for gonorrhoea and 82-83% for chlamydia, non-inferior to samples taken in the clinic. The home swabs even caught six chlamydia infections that the clinic-collected specimens missed. Extragenital testing does not require anyone to be examined.
What to ask for, in plain words
Clinics do not always offer the swabs, and in several countries they still have to be requested. The sentence that works is short: a throat swab and a rectal swab for gonorrhoea and chlamydia, plus blood for HIV and syphilis. Naming the sites is what matters, because a request for “a full screen” is interpreted differently everywhere, and in practice it often means blood and urine.
Where to get tested in the Canary Islands
Checkpoint Canarias, in Playa del Inglés
Checkpoint Canarias is the local answer to everything above, and it is worth knowing about for anyone living in or visiting the south of Gran Canaria. It is run by the Asociación de Bienestar Sexual Integral de Canarias, a non-profit, and it opened a multipurpose centre with its own clinical unit in Maspalomas in January 2026. Testing is free and anonymous, requiring only the first letter of a name, and it covers HIV, hepatitis B and C, syphilis, chlamydia and gonorrhoea, with samples taken from blood, urine, rectum and throat according to practices. In other words, they do extragenital testing as standard, which is exactly what most general services still leave out.
The address is CC Eurocenter, floor 3, unit 185, Avenida de Moya 6, Playa del Inglés, 35100, the phone number is 828 643 210 and the email is info@checkpointcanarias.com. Appointments are required and they fill up fast, with slots generally released in the last week of the preceding month. One limit worth knowing before going: at present they screen and refer, they do not treat, while they work towards the authorisations to do so.
The rest of the island
The Canary Islands government lists three other rapid testing points alongside Checkpoint: Amigos contra el Sida in Las Palmas and Vecindario, Colectivo GAMÁ on Paseo Tomás Morales, and Médicos del Mundo on Calle Doctor Verneau. All of them work by appointment. Worth asking each one directly whether extragenital testing is included, because the answer is not the same everywhere.
What comes after
Doxy-PEP
For anyone who keeps testing positive, there is now an option beyond finding infections faster. CDC guidance from 2024 recommends counselling men who have sex with men and transgender women who have had a bacterial STI in the past 12 months about doxycycline post-exposure prophylaxis: 200 mg within 72 hours of sex, never more than 200 mg in 24 hours. Across trials it cut syphilis by around 70%, chlamydia by 70 to 88% and gonorrhoea by roughly half. It does not replace screening, it requires it: the same guidance asks for bacterial STI testing at the sites of exposure every three to six months.
When to talk to a doctor
Any symptom at any site deserves an appointment rather than a wait, and so does a partner’s positive result even with nothing showing. Two other conversations are worth having deliberately: whether doxy-PEP fits, and whether HIV prevention should move to something continuous, which the article on injectable PrEP sets out. And if a clinic declines extragenital testing outright, that is a reason to try another clinic, not a reason to accept the result.
Extragenital testing is not exotic medicine. It is three samples instead of two, once a year at minimum, done at home if that is easier, and asked for by naming the sites. The reason it matters is that the alternative is not a small blind spot but the larger share of what there is to find, handed back as a negative result.
Contact
Questions about any of this, or something you would rather ask privately? Write to me through puppy-play.com/contact and I will answer.
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