Sexual health screening (no symptoms) (Asymptomatic sexually transmitted infection screening)
A confidential set of tests for common sexually transmitted infections when you feel well and have no symptoms, to find and treat anything you may not know you have.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Many STIs have no symptoms, so testing when you feel well is the only way to find them.
- A standard screen usually covers chlamydia, gonorrhoea, HIV and syphilis, with hepatitis added depending on your history.
- Timing matters: a test soon after a possible exposure can miss an infection, so a repeat may be needed after the window period.
- Screening is free and confidential on the NHS, including home kits in many areas; treatment is straightforward and partners can be supported.
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 infections you may not know you have, before they cause harm.
You have symptoms such as discharge, sores, pain or a rash; you need an assessment, not a routine asymptomatic screen.
Giving samples takes only a few minutes. A blood test may sting briefly and leave a small mark.
A clear, confidential way of giving results and explaining what they mean.
Giving samples takes only a few minutes. A blood test may sting briefly and leave a small mark.
You can carry on as normal. If you have given samples at a clinic, you will be told how and when results come back.
Most results are ready. Many services only contact you if something needs action, or send a clear all-clear; check...
You may be advised to repeat HIV, syphilis or hepatitis testing after the window period to be confident of the...
What is sexual health screening when you have no symptoms?
Many sexually transmitted infections cause no symptoms at all, especially early on. You can carry chlamydia, gonorrhoea, HIV, syphilis or hepatitis without feeling unwell, and still pass them on. Screening means testing for these infections when you feel fine, so anything hidden can be found and treated.
A standard screen usually checks for chlamydia and gonorrhoea (from urine or swabs you can often take yourself) and for HIV and syphilis (from a blood test). Depending on your history, it may also include hepatitis B and C. The exact tests are tailored to you, your body and your sexual practices.
Screening is confidential and non-judgemental. You can be tested at a clinic or, in many areas, with a free home kit you post back. It is a normal part of looking after your health, not something to feel embarrassed about.
An important point is timing. Some infections take time to show up on a test after you have been exposed; this gap is called the window period. A negative result does not always rule out a very recent exposure, so the timing of your test matters and a repeat test is sometimes advised.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Clinic test versus home self-sampling kit
| Feature | Clinic test | Home kit |
|---|---|---|
| Who it suits | Symptoms, worries or advice needed | No symptoms, prefer privacy |
| Samples | Staff can help and add swabs | You take them yourself |
| Advice on the day | Yes, face to face | By phone or message |
| Speed of treatment | Sometimes same day | Referred in if positive |
Both are confidential and free on the NHS in many areas. Home kits are for people without symptoms; see a clinic if you have symptoms.
Preparing for your test
- Think about when your last possible exposure was, so the timing of your tests can be judged against the window period.
- If using a urine sample for chlamydia and gonorrhoea, try not to pass urine for about an hour beforehand.
- Be ready to share, confidentially, the kinds of sex you have had, so the right sites are tested.
- Note any symptoms, even mild ones; if you do have symptoms, ask for an assessment rather than a routine screen.
- Bring details of any previous STI tests, results or treatments if you have them.
- If using a home kit, follow the instructions exactly and post it back promptly.
- Make sure the service has a safe way to contact you with results.
What happens
If you attend a clinic, staff ask, in confidence, a few questions about your sexual history so they can choose the right tests. There is no judgement; the questions are to keep you safe and test the right sites.
For chlamydia and gonorrhoea you usually give a urine sample or take a swab yourself from the vagina, throat or rectum. For HIV and syphilis, and sometimes hepatitis, a small blood sample is taken from your arm or, in some services, a finger-prick. Taking the samples is quick and not usually painful.
With a home kit, you collect the samples yourself following the instructions and post them to the lab. Either way, your samples are tested and you are contacted confidentially with the results, usually within a few days, along with advice on anything that needs treatment or a repeat test.
Is this test 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…
- You have symptoms such as discharge, sores, pain or a rash; you need an assessment, not a routine asymptomatic screen.
- You are testing too soon after a possible exposure for some tests to be meaningful.
- You need emergency care after a high-risk exposure, where urgent HIV prevention (PEP) may be time-critical.
- You expect the screen to rule out every possible infection, including those not tested for.
Delay or rearrange if…
- Your last possible exposure was very recent, so HIV, syphilis or hepatitis tests may not yet be reliable.
- You have new symptoms; these should be assessed rather than waiting on a routine screen.
- You are within a window where a repeat test will be needed anyway, and a single early test may mislead.
- You cannot receive results confidentially at this time.
Alternatives to discuss
- A clinic assessment if you have symptoms or a specific worry.
- Urgent care and possible PEP after a recent high-risk HIV exposure.
- Targeted single-infection testing where only one risk is relevant.
- Regular scheduled screening rather than one-off testing if you have ongoing risk.
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 infections you may not know you have, before they cause harm.
- Allows early, usually simple treatment that protects your health.
- Reduces the chance of passing an infection to partners.
- Reassurance when results are clear, with advice on when to test again.
- Confidential and, on the NHS, free, with home options that fit around your life.
Risks & complications
- Mild discomfort or a small bruise from the blood test.
- Anxiety while waiting for results.
- A false sense of all-clear if tested too soon after a possible exposure (window period).
- Needing a repeat test to be sure after a recent exposure.
- A sample that cannot be processed, so a repeat is needed.
- An unclear or borderline result that needs a confirmatory test.
- Finding an infection you were not expecting, which can be distressing.
- A false positive that causes worry until a confirmatory test clarifies it.
- A false negative despite correct timing, which is why advice on re-testing matters.
The main limitation is timing. Tests for HIV, syphilis and hepatitis can take weeks after exposure to become reliable, so a negative result soon after a risk may need repeating. Ask the service when your tests are reliable for your situation, and what to do if you have a new risk before then. Screening checks for specific infections only; it cannot rule out every condition.
Published figures to discuss
Modern STI tests are accurate, but no test is perfect. Sensitivity depends on testing the right site at the right time. Window periods mean early tests can miss infection. Because rates depend on the test used, the population and the timing, exact figures are not given here; the points below describe the main accuracy considerations qualitatively.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| False negative if tested inside the window period | Higher soon after exposure; falls as the window period passes | Chlamydia and gonorrhoea tests are usually reliable after about two weeks; HIV, syphilis and hepatitis blood tests take longer. | Guide sourcesClinical context |
| Need for a repeat or confirmatory test | Uncommon, but expected for borderline results or early testing | A confirmatory test is standard practice for some positive screening results before a diagnosis is made. | Guide sourcesClinical context |
| Wrong-site testing | History-dependent | Rectal and throat infections may be asymptomatic and missed unless those sites are sampled. | NHS — Sexually transmitted infections (STIs)nhs.ukSource-linked context |
| Positive result without symptoms | Expected screening scenario | Many STIs are asymptomatic; treatment and partner notification still matter even when you feel completely well. | Guide sourcesClinical 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 nothing physical to recover from. Afterwards is mainly about waiting for results and knowing what they do, and do not, tell you.
- A small bruise or tender spot where blood was taken.
- Feeling anxious until results arrive.
- No change in how you feel, since screening is for people without symptoms.
- Being asked to test again later if you tested soon after a risk.
Aftercare
- Note when and how you will get your results, and who to contact if they do not arrive.
- Avoid sex, or use condoms, if you are waiting on results after a possible exposure.
- If advised, book a repeat test after the window period.
- If a result is positive, start the recommended treatment and avoid sex until told it is safe.
- Accept the offer of confidential partner notification support if you test positive.
- Keep a note of your results and the date for your own records.
- Save the clinic or service contact details.
- Set a reminder for any repeat test you are advised to have.
- Make sure your phone or email for results is correct and private.
- Plan how you will avoid passing on infection while awaiting results.
- Have condoms available in the meantime.
- Note the date of your screen for future reference.
⚠ Get urgent help if…
- Pain, unusual discharge, sores, blisters or a rash appearing while you wait — ask for an assessment rather than relying on a routine screen.
- Fever, feeling generally unwell or swollen glands after a recent risk, which need prompt review.
- Severe lower-abdominal or testicular pain, which should be seen urgently.
- Spreading redness, swelling or fluid leaking from where blood was taken.
- A new possible exposure before your repeat test is due, which you should mention to the service.
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 clear (negative) screen means the infections tested for were not found at the time and sites tested, provided the timing was right for each test. It does not rule out infections that were not tested for, or a very recent exposure still inside its window period.
A positive result means an infection was found. Most are straightforward to treat, often with antibiotics or, for some viruses, ongoing care. The service will explain what the result means, arrange treatment, and offer confidential help to let partners know so they can be tested too.
A screen reflects your status at the time of testing. It does not protect you going forward, so it stays useful only until your next possible exposure. Many people test with each new partner, and some test regularly. People at higher ongoing risk, or those using HIV prevention such as PrEP, are usually advised to screen more often. Your specialist can suggest a sensible interval for you.
Related tests, treatments or support
Screening is often done alongside a conversation about contraception, HIV prevention such as PrEP, and hepatitis A and B vaccination for those at higher risk. People diagnosed with one infection are usually tested for others, because they can occur together. Cervical screening is separate and tests for a different thing.
Follow-up & long-term care
How you receive results varies: some services text an all-clear, others only contact you if something needs action. If a test was done early, you will be advised when to repeat it. If anything is positive, you will be contacted to arrange treatment, advice and confidential partner notification support.
- Test with each new partner, and regularly if you have ongoing risk.
- Repeat HIV, syphilis or hepatitis tests after the window period when advised.
- Consider hepatitis A and B vaccination if you are at higher risk.
- Use condoms to lower the chance of future infection.
- Keep a personal record of test dates and results.
Repeat, follow-on and what comes next
- A repeat test is often advised if the first was done early after a possible exposure.
- Some positive screening results need a confirmatory test before treatment.
- Samples occasionally cannot be processed and need to be repeated.
- Screening intervals should be reviewed as your circumstances and risk change.
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, confidential way of giving results and explaining what they mean.
- Advice on when, if at all, to repeat a test after the window period.
- A straightforward route to treatment if a result is positive.
- An offer of confidential partner notification support, including anonymous options.
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:
- How many infections are tested for and how many sites are sampled.
- Clinic appointment versus a postal self-sampling kit.
- Standard turnaround versus a faster, same-day result service.
- Whether a consultation or advice session is included.
- Whether confirmatory testing is included if a result is borderline.
- Whether treatment and follow-up are included if something is positive.
- Exactly which infections and which sites are included.
- How and when results are given, and how quickly.
- Whether a clinician reviews the results and gives advice.
- What happens, and what it costs, if a result is unclear or positive.
- Whether treatment and partner notification support are included or referred on.
- Whether a repeat test after the window period is included if needed.
On the NHS? Sexual health screening is free and confidential on the NHS, including home self-sampling kits in many areas; private testing exists mainly for speed, convenience or a wider panel.
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
- Not explaining that a negative result does not cover infections outside the panel.
- Not explaining the window period, so an early negative is mistaken for an all-clear.
- Not being clear about who can see the results and how they are delivered.
- Not testing the relevant sites (throat, rectum) for the kinds of sex the person has.
Marketing red flags
- Claims that a test rules out everything or guarantees you are clear.
- Same-day results promoted without explaining window-period limits.
- Costly large panels that include rarely useful tests.
- No clear plan for treatment or partner support if something is positive.
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.
- Which infections are you testing me for, and which sites are being sampled?
- Given when I was last at risk, is now the right time to test, or should I repeat it?
- What does a normal result rule out, and what does it not?
- How and when will I get my results, and who can see them?
- If something is positive, what treatment and partner support is available?
- How often should someone like me be screened?
- 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 test, 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 test 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
Is screening really free and confidential?
I feel completely well — why test?
How soon after sex can I test?
Will a normal result rule everything out?
Do I have to give samples in front of staff?
What happens if I test positive?
Is a home kit as good as going to a clinic?
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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 — Sexually transmitted infections (STIs) BASHH — Summary guidance on testing for STIs (2023) BASHH/BHIVA — UK guidelines for HIV testing (window period) NICE CKS — Sexually transmitted infections
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.
Related guides: Full STI screen · Express / rapid STI testing · HIV test · Sexually transmitted infection assessment · Sexual health (GUM) consultation