Chlamydia test and treatment (Chlamydia trachomatis testing and antibiotic treatment)
A test to check for chlamydia, the most common bacterial sexually transmitted infection in the UK, and a short course of antibiotics to clear it if found.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Chlamydia is very common and usually causes no symptoms, so testing is the only reliable way to know you have it.
- It is treated with a short course of antibiotic tablets, and most people are cleared if they take them correctly.
- A test taken too soon after sex can miss a recent infection, so timing matters and a repeat test is sometimes advised.
- Free, confidential testing and treatment are available on the NHS at sexual health clinics, including partner notification, so you do not have to pay privately.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Finds an infection that usually has no symptoms, so it can be treated before it causes harm
A single chlamydia test is not enough if you have symptoms suggesting a different or more serious problem that needs examination.
Giving urine or a self-taken swab takes only a few minutes and is usually not painful or mildly uncomfortable. You can carry on with your day straight...
A clear result process and a named way to contact the service with questions.
Giving urine or a self-taken swab takes only a few minutes and is usually not painful or mildly uncomfortable. You...
Results usually come back within a few days to two weeks, often by text. A clinic may treat symptoms straight away...
Take the antibiotics exactly as directed. Avoid all sex (including with a condom) until you and any partner have...
Most people need no further test. A test of cure is advised in pregnancy or for a rectal infection, usually at...
What is a chlamydia test and treatment?
Chlamydia is an infection caused by a bacterium called Chlamydia trachomatis. It is passed on through vaginal, anal or oral sex, and it is the most common bacterial sexually transmitted infection (STI) in the UK, especially in people under 25.
Most people with chlamydia have no symptoms at all, so a test is the only way to know. The test usually means giving a urine sample or taking a simple swab (which you can often do yourself). If chlamydia is found, it is treated with a short course of antibiotic tablets.
Testing and treatment matter because, left untreated, chlamydia can spread and cause more serious problems, such as pelvic inflammatory disease and, in some people, problems with fertility. A test tells you whether you have it now; it cannot tell you exactly when or from whom you caught it.
NHS sexual health (genitourinary medicine, or GUM) clinics offer this free and confidentially. You do not need to pay, and you do not need a GP referral.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
NHS sexual health clinic vs private testing
| Point | NHS clinic | Private |
|---|---|---|
| Cost | Free | You pay |
| Confidential | Yes | Yes |
| Partner notification help | Yes, offered | Varies |
| Treatment included | Yes, free | May be extra |
Free NHS testing and treatment is high quality and confidential. People sometimes choose private testing for speed or convenience, but it is not more accurate, and you should check that treatment and partner notification are included.
Preparing for your treatment
- Try not to pass urine for about 1 to 2 hours before giving a urine sample, as this can make the test more reliable.
- Think about the timing: a test very soon after sex can miss a recent infection, so ask the clinic when to test.
- Note when you last had sex and with whom if you can, as this helps with partner notification later.
- Tell the clinic if you are pregnant or might be, as this changes which antibiotic is safe.
- Tell the clinic about any antibiotic allergies.
- If using a postal kit, read the instructions first and take samples from the right sites (some kits include throat and rectal swabs).
- You do not need to bring ID or proof of address, and you do not have to give your GP's details if you prefer not to.
What happens
At a clinic, a receptionist or clinician will ask a few questions about your symptoms and recent sexual contacts. This is confidential and is used to decide which samples to take and to help notify partners later.
You will usually give a urine sample or take a swab yourself in private. If you have symptoms or have had anal or oral sex, extra swabs may be taken. The samples go to a laboratory.
If you already have symptoms, the clinic may start treatment straight away rather than wait for the result. Otherwise, you are contacted with your result, often by text, and treatment is arranged if needed.
If you use a home kit, you take the samples yourself, post them back, and receive your result by text, phone or secure message.
Is this treatment right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- A single chlamydia test is not enough if you have symptoms suggesting a different or more serious problem that needs examination.
- A urine test alone can miss rectal or throat infection, so it is the wrong test if you have had anal or oral sex and only urine is offered.
- Testing is not a substitute for treatment if you already have clear symptoms; treatment may be started without waiting for the result.
- Self-testing at home may not suit you if you need an examination, have complex symptoms, or want same-day treatment.
Delay or rearrange if…
- It is very soon after the sex you are worried about, as a too-early test can miss infection; ask about timing.
- You have severe pelvic or testicular pain, fever or feel very unwell, which needs assessment rather than a routine test.
- You are unsure whether you are pregnant, as this affects which antibiotic is safe; tell the clinic.
- You cannot avoid sex during a treatment course, as this risks passing the infection back and forth.
Alternatives to discuss
- A full sexual health screen covering several infections at once.
- Testing through a free NHS sexual health clinic instead of a private provider.
- An in-person clinic assessment rather than a home kit if you have symptoms.
- Waiting and retesting at the right time if you have tested very early after exposure.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Finds an infection that usually has no symptoms, so it can be treated before it causes harm
- Treatment clears the infection in most people and protects your future fertility
- Helps protect sexual partners through treatment and partner notification
- Reduces the chance of complications such as pelvic inflammatory disease
- Gives peace of mind and is part of looking after your sexual health
- Free and confidential on the NHS, with no need to pay or be judged
Risks & complications
- Mild discomfort taking a swab or none at all
- Stomach upset, feeling sick or diarrhoea from the antibiotics
- Sensitivity to sunlight while taking doxycycline (cover up or use sun cream)
- A test taken too early can be falsely negative, so an infection may be missed
- Thrush after antibiotics, especially in women
- Needing a repeat test if the sample was inadequate or taken too soon
- Anxiety or worry while waiting for results or telling partners
- An allergic reaction to the antibiotic
- Treatment not clearing the infection, needing a different antibiotic or a test of cure
The main pitfall is timing: chlamydia may not show up if you test within the first week or two after sex, so a clinic may advise testing now and again later. The test itself is very low risk. If you are pregnant, tell the clinic, because the antibiotic is different and a test of cure is recommended.
Published figures to discuss
Chlamydia testing is very accurate when samples are taken correctly and at the right time, but no test is perfect. The main reasons for a missed infection are testing too soon after exposure or not sampling the right site (for example, missing a rectal or throat infection). Cure rates are high with a correctly taken antibiotic course, but reinfection is common if partners are not treated, so figures vary by population and behaviour rather than reflecting test failure.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Cure after a correctly taken antibiotic course | More than 95% (NHS) | Depends on taking the full course correctly and avoiding sex until treatment is complete. | NHS — Chlamydianhs.ukPublished figure |
| False negative if tested too soon | Window-period dependent | Testing within the first week or two after exposure can miss infection, so repeat testing may be advised. | NHS — Chlamydianhs.ukSource-linked context |
| Throat or rectal infection missed | Sample-site dependent | A urine or vaginal swab does not exclude infection at sites exposed during oral or anal sex. | NHS — Chlamydianhs.ukSource-linked context |
| Reinfection after treatment | Common enough to recommend repeat testing in many patients | Partners need testing/treatment and many services advise retesting at about 3 months. | NHS — Chlamydianhs.ukSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is no physical recovery from the test. After treatment, the main thing is to avoid sex until you and your partner have finished the course, so you do not pass the infection back and forth.
- No physical after-effects from the test itself
- Mild stomach upset or nausea while on antibiotics
- Feeling relieved, anxious or upset; all are normal reactions
- Symptoms (if you had them) usually settle within a week or two of starting treatment
- Needing to arrange partner notification, which the clinic can do for you anonymously
Aftercare
- Finish the whole antibiotic course even if you feel fine.
- Avoid vaginal, anal and oral sex until you and your partner(s) have completed treatment.
- Tell recent sexual partners so they can be tested and treated; the clinic can do this anonymously if you prefer.
- Take doxycycline with food and avoid strong sunlight, as it can make skin burn more easily.
- If you are pregnant, arrange the recommended test of cure.
- Consider a repeat test in about 3 months, as reinfection is common.
- Contact the clinic if symptoms continue or come back after treatment.
- Think about regular testing and condoms to lower the chance of future infection.
- List of recent sexual partners, if you can, to help notification
- Knowing how the clinic will send your result (often by text)
- Antibiotic allergies noted
- A plan to avoid sex during the treatment course
- A reminder set to finish the full course
- The clinic's contact number saved in case of problems
- A note to book a repeat test in about 3 months
⚠ Get urgent help if…
- Lower tummy or pelvic pain that is getting worse
- Pain or bleeding during or after sex
- Bleeding between periods or much heavier periods
- Fever, feeling generally unwell, or pain and swelling in the testicles
- Symptoms that do not improve, or come back, after finishing treatment
- A rash, swelling of the face or mouth, or difficulty breathing after taking the antibiotic (seek urgent help)
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
A negative (clear) result usually means no chlamydia was found in the sample, although a test taken very soon after sex can miss a recent infection. A positive result means chlamydia was found and should be treated.
A result tells you about the present; it cannot tell you exactly when you caught the infection or from whom, so it should not be used to blame a particular partner. After treatment, most people do not need a repeat test to confirm cure, but this is recommended in pregnancy and for rectal infection.
A clear result reflects the time of the test only. Because you can catch chlamydia again at any time, a negative result does not protect you in the future. Regular testing is sensible if you have new or multiple partners, and a repeat test about 3 months after treatment is often advised because reinfection is common.
Related tests, treatments or support
Chlamydia testing is usually done as part of a wider sexual health check that can also include gonorrhoea, HIV, syphilis and sometimes hepatitis B and C, depending on your history. Testing for several infections at once is normal and efficient, because they share similar risks and many have no symptoms.
Follow-up & long-term care
Most people need no routine follow-up after successful treatment. The clinic will arrange a test of cure if you are pregnant or had a rectal infection, usually at least 3 weeks after treatment. They will also help with partner notification and can advise on a repeat test in about 3 months. Contact them sooner if symptoms persist or return.
- Use condoms to lower the risk of future infection.
- Have regular sexual health checks if you have new or multiple partners.
- Make sure partners are tested and treated to avoid passing it back and forth.
- Test again in about 3 months after treatment, as reinfection is common.
Repeat, follow-on and what comes next
- A repeat test is needed if the first sample was inadequate or taken too soon after exposure.
- A test of cure is recommended in pregnancy and for rectal infection, usually at least 3 weeks after treatment.
- Reinfection is common, so a repeat test at about 3 months is often advised even after successful treatment.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A clear result process and a named way to contact the service with questions.
- Free treatment if the result is positive, with advice on finishing the course and avoiding sex.
- Help with partner notification, anonymously if you prefer.
- Advice on a test of cure where needed and a repeat test at about 3 months.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Whether you use the free NHS service or pay for private testing
- Which sites are tested (urine only, or vaginal, rectal and throat swabs)
- Whether the test is done in clinic or by postal kit
- How quickly results and treatment are provided
- Whether antibiotics and partner notification are included in a private package
- Whether you also test for other infections at the same time
- The cost of the test and which sites it covers
- Whether treatment (antibiotics) is included if the result is positive
- How and when you will get your result
- Whether a test of cure or repeat test is included if needed
- Whether partner notification support is provided
- What happens, and what it costs, if the sample is inadequate and must be repeated
On the NHS? Chlamydia testing and treatment are free and confidential on the NHS at sexual health (GUM) clinics, with free home kits for under-25s in many areas; private testing is an option for speed or convenience but is not more accurate.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Only a urine sample is taken when you have also had anal or oral sex, missing those sites.
- No clear explanation that a too-early test can be falsely negative.
- Treatment, partner notification or a needed repeat test is not included in a private package and costs extra.
- Not being told who will see your result or how confidentiality is protected.
Marketing red flags
- Suggesting a single negative test rules out all sexually transmitted infections for the future.
- Charging for a test without explaining that the NHS offers it free and confidentially.
- Not mentioning window periods, so a too-early test gives false reassurance.
- Selling a test but leaving out treatment or partner notification.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- When is the best time to test after the sex I am worried about?
- Which sites should be tested given the type of sex I have had?
- What happens if my result is positive, and is treatment included today?
- Do I need a test of cure, and if so, when?
- Can you help me tell my partners anonymously?
- Should I be tested for other infections at the same time?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my treatment, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this treatment not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Do I have to pay to be tested or treated?
How soon after sex can I test?
Will anyone find out?
Does treatment always work?
Do I need a test to confirm it has gone?
Can chlamydia affect my fertility?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NHS — Chlamydia NHS — Chlamydia treatment BASHH — chlamydia and gonorrhoea treatment update (doxycycline first line) Terrence Higgins Trust — Chlamydia SH:24 — STI testing window periods
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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