A chlamydia test on Koh Samui is simple: most clinics test for chlamydia and gonorrhoea together with one PCR test, using a urine sample or a swab. The best time to test is from about two weeks after sex, or sooner if you have symptoms.
Both infections are common, often cause no symptoms, and are treatable with antibiotics. The key is testing the right body sites at the right time.
Chlamydia and gonorrhoea: the basics
Chlamydia and gonorrhoea are bacterial infections passed on through vaginal, anal and oral sex. They can infect the genitals, the throat and the rectum, and sometimes the eyes.
The NHS notes that most people with chlamydia do not have any symptoms. Gonorrhoea is also often silent, especially in the throat and rectum. That is why testing is the only way to know.
Left untreated, either infection can cause pain, pelvic inflammatory disease or fertility problems. Early testing and treatment prevent most of these problems.
Chlamydia vs gonorrhoea compared
The two infections behave in similar ways, which is why clinics test for both at once. There are still some differences worth knowing.
Chlamydia vs gonorrhoea at a glance
| Chlamydia | Gonorrhoea | |
|---|---|---|
| Common symptoms | Burning when peeing, unusual discharge, pelvic or testicular pain, bleeding after sex | Similar, often with thicker yellow or green discharge; sore throat or anal discomfort |
| Often silent? | Yes, most people have no symptoms | Often, especially in the throat and rectum |
| Test sample | Urine or swab, tested by PCR | Urine or swab, tested by PCR, sometimes culture |
| When to test | From about 2 weeks after sex, or sooner with symptoms | From about 2 weeks after sex, or sooner with symptoms |
| Treatment | Antibiotics prescribed by a doctor | Antibiotics prescribed by a doctor, with a follow-up test often advised |
Chlamydia symptoms to watch for
When chlamydia does cause symptoms, they often appear one to three weeks after sex, but they can start much later. Watch for:
- pain or burning when you pee
- unusual discharge from the vagina, penis or bottom
- bleeding between periods or after sex
- pain in the lower tummy or the testicles
Symptoms can also come and go, so feeling better does not mean the infection has cleared. Gonorrhoea symptoms are similar and usually appear within about two weeks.
When to test after sex
These infections need a few days to build up to a level the test can find. Testing the morning after sex will not show an infection from the night before.
- About 1 week: some infections can be found, but a negative result is less certain.
- About 2 weeks: a good time for a reliable test.
- Any time with symptoms: see a doctor straight away rather than waiting.
For a timeline across all infections, see our guide on when to get an STD test after unprotected sex. If a condom broke in the last three days, HIV PEP comes first. Our plan for what to do after a condom breaks on Koh Samui covers that.
Urine test or swab? Choosing the right sample
The most common mistake is testing only urine after oral or anal sex. A urine test finds genital infections, but it will miss infections in the throat or rectum.
Sample types for chlamydia and gonorrhoea testing
| Sample | Finds infection in | Pros | Cons |
|---|---|---|---|
| First-catch urine | Penis or urethra (also used for vaginal testing) | Painless, quick | Misses throat and rectal infection; avoid peeing for about an hour first |
| Vaginal swab (often self-taken) | Vagina and cervix | Very accurate, private, usually painless | Needs a few private minutes; ask if unsure how |
| Throat swab | Throat | Needed after oral sex | Brief gag feeling |
| Rectal swab (often self-taken) | Rectum | Needed after receptive anal sex | Some people feel awkward; self-swabbing helps |
| Urethral swab | Penis | Sometimes used when there is discharge | Uncomfortable; now rarely needed |
Tell the doctor which kinds of sex you had. You do not need to go into detail, but it decides which swabs make sense. The doctor will assess your situation and suggest the right combination.
Typical chlamydia and gonorrhoea test prices
Prices vary with how many sites are tested and whether other infections are added. These are typical market ranges from published clinic prices in Thailand in 2026. They change often, so message us for our current price.
Chlamydia and gonorrhoea test prices (typical 2026 ranges)
| Option | Usually includes | Result time | Typical range (THB) |
|---|---|---|---|
| Doctor consultation | Advice on which sites to test, symptoms review | Same visit | About 500–1,000 |
| Chlamydia and gonorrhoea PCR, one site | Urine or one swab | About 1–3 days | About 1,500–3,500 |
| Chlamydia and gonorrhoea PCR, three sites | Genital, throat and rectal samples | About 1–3 days | About 3,500–7,000 |
| Multi-infection PCR panel | Chlamydia, gonorrhoea plus other infections such as trichomonas or mycoplasma | About 1–3 days | About 3,000–6,500 |
For a wider overview of costs, including HIV and syphilis, see our guide to typical STD test prices on Koh Samui.
Treatment and why not to self-treat
If a test is positive, a doctor will prescribe the right antibiotics. Partners from the last few months usually need testing or treatment too, so you do not pass the infection back and forth.
It can be tempting to buy antibiotics from a pharmacy instead. Please do not. UK travel health advice notes that drug-resistant gonorrhoea has been reported in travellers returning from Thailand, and the wrong medicine can leave an infection behind.
After treatment
- Avoid sex until you and your partners have finished treatment and the doctor says it is fine.
- A repeat test is often advised after gonorrhoea treatment, and a routine re-check a few months later is sensible for both infections.
- Being treated once does not protect you from catching either infection again.
Chlamydia and gonorrhoea testing on Koh Samui
Our confidential HIV and STI testing service covers urine and swab testing for both infections. Self-taken swabs are usually possible if you prefer privacy.
Tips before your visit
- Do not pee for about an hour before a urine test.
- Bring a list of any medicines, including recent antibiotics.
- Consider adding HIV and syphilis blood tests. Our guides to the HIV window period and syphilis testing on Koh Samui explain when these are useful.
If you have regular new partners, ask about HIV PrEP on Koh Samui and a three-monthly STI screen.
Frequently asked questions
How soon can chlamydia show up on a test?
Some infections show within a week, but about two weeks after sex is a good time for a reliable result.
Is a urine test enough for gonorrhoea?
It is enough for genital infection. After oral or anal sex, throat or rectal swabs are needed as well.
Can I have chlamydia without symptoms?
Yes. Most people with chlamydia have no symptoms, which is why routine testing matters.
Do I need to tell my partner?
It is strongly recommended, so they can be tested and treated. A doctor can help you plan what to say, and your results stay confidential.
Can I have sex while waiting for results?
It is safest to wait, especially if you have symptoms. Ask the doctor what makes sense for you.
Book a chlamydia and gonorrhoea test
Testing is quick, usually painless and completely confidential. A doctor can tell you which samples you need and when to test for the most reliable result. You can message a doctor privately on WhatsApp to arrange a chlamydia and gonorrhoea test on Koh Samui.