Sexually transmitted infection assessment

What is a sexually transmitted infection assessment?

A sexually transmitted infection (STI) assessment is a clinician-led look at your risk of infections passed on through sex, and a plan for the right tests. It involves talking through any symptoms, recent sexual contacts, travel and other risks, so that testing is tailored to you rather than a one-size-fits-all panel.

It is often part of broader infection care — for example when an infectious diseases or general clinician is investigating symptoms such as fever, a rash, swollen glands or feeling generally unwell, where an STI is one possible cause among several. It can also follow a known exposure or a partner's diagnosis.

The assessment decides which tests are useful and when. Common ones include HIV, syphilis, chlamydia and gonorrhoea, with extra tests such as hepatitis B and C, or others, added depending on your history. Throat and rectal samples may be needed depending on the kinds of sex you have had.

Timing matters. Each infection has a 'window period' — the gap between catching it and it showing on a test. A test done too soon can miss an early infection, so you may be advised to test again later.

Free, confidential STI assessment and testing is available to everyone on the NHS, including through sexual health (GUM) services. You should never feel you must pay, although some people choose private care for speed or convenience.

Types, options & approaches

There may be different ways to do this. The right approach depends on the clinical question and your circumstances.

Assessment versus a fixed test panel

An assessment helps avoid both over-testing and missed infections by matching tests to your situation.

Preparing for your test

• Note any symptoms and when they started, plus when you last had sex.
• Think about recent partners, types of sex, and any travel, as these guide testing.
• Bring a list of medicines, allergies, and any recent antibiotic use.
• Mention a partner's known infection or any recent exposure.
• Avoid passing urine for about 1–2 hours before if a urine sample may be needed.
• Decide how you want results and whether you want to use a chosen name.
• If you might have been exposed to HIV in the last 72 hours, seek urgent advice about prevention (PEP) rather than waiting.

What happens

The clinician asks about your symptoms, recent sexual contacts, types of sex, travel and general health. These questions are personal but guide which tests are useful — staff ask them routinely and without judgement.

If you have symptoms, you may be examined. Tests may include self-taken or clinician-taken swabs, a urine sample, and blood for HIV and syphilis. Throat and rectal swabs are added if relevant. Sometimes other infection tests are done at the same time if your illness could have several causes.

Some rapid tests give a result the same day; most go to the laboratory and take a few days to about two weeks. You will be told how and when to expect results, what any treatment involves, and whether partners should be checked confidentially.

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.

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.

The main pitfalls are timing and scope. A normal result only covers the infections tested and only once enough time has passed since exposure. If you are unwell, an STI may be only one possible cause, so other tests may be needed too. Ask what is being tested, whether site-specific samples apply to you, and when to retest.

Published figures to discuss

The assessment itself carries no meaningful procedural risk. The key uncertainties are test accuracy and timing: a test taken too early can be falsely negative, a normal result only covers the infections tested, and very rarely a screening test is falsely positive and needs confirmation. When someone is unwell, an STI may be only one of several possible causes. Exact figures depend on the specific test and infection, so clinical judgement and timing advice matter more than any single number.

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. 'Afterwards' is about getting your results, completing any treatment, retesting if you tested early, and telling partners where needed.

• A small bruise from a blood test, or mild soreness from a swab.
• Waiting a week or two for some results.
• Being asked to retest if you tested inside the window period.
• No physical after-effects from the assessment.

Aftercare

• Get your results in the way you agreed and follow up if you do not hear back.
• Complete any prescribed treatment in full, even if symptoms settle.
• Avoid sex, or use condoms, for the advised time after treatment.
• Tell recent partners if asked — the service can do this anonymously for you.
• Note when to retest if you tested early after a possible exposure.
• Consider vaccination (such as hepatitis B) or HIV prevention (PrEP) if advised.
• Contact the service if symptoms worsen or new ones appear.

• Note symptoms, their start date, and your last sexual contact
• List recent partners, types of sex and any travel
• Bring medicines, allergies and recent antibiotic details
• Avoid urinating for 1–2 hours before a urine sample
• Decide how to receive results
• Plan a retest date if testing early after a risk
• Save the service's contact details

⚠ Get urgent help if…

• High fever, severe headache, neck stiffness or a spreading rash — seek urgent care.
• Severe lower abdominal or pelvic pain, or testicular pain and swelling.
• Painful genital sores, severe genital swelling, or being unable to pass urine.
• Feeling rapidly more unwell after a possible infection.
• A possible HIV exposure in the last 72 hours — seek urgent advice about prevention (PEP).
• A severe reaction to any treatment, such as swelling or breathing difficulty — call 999.

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 normal set of results means no infection was detected in the tests done, at the time they were done. It does not rule out an infection caught very recently, and it does not cover infections that were not tested for — so ask exactly what was included.

If an infection is found, most common STIs are very treatable, often with a short course of medicine. If you were unwell, the clinician will also consider whether another cause needs treating. You will be told about treatment, when sex is safe again, partner notification and any follow-up.

Results only reflect your sexual health up to the date of testing and the window periods involved. New partners or risks mean you may need reassessment. People who change partners are often advised to test every few months; people in a stable relationship need testing far less often.

Related tests, treatments or support

An STI assessment is often combined with HIV and syphilis blood tests, hepatitis screening or vaccination, and sometimes broader infection tests when you are unwell. Prevention medicine (PrEP/PEP) and contraception advice may be offered at the same visit.

Follow-up & long-term care

Follow-up depends on the findings: reassurance if clear, retesting after a window period, treatment with a possible test-of-cure, or referral for specialist care. Partner notification, where needed, is arranged with your agreement and kept confidential.

• Reassessment if you have new or multiple partners.
• Hepatitis B vaccination course completion if started.
• Ongoing HIV-prevention medicine (PrEP) with monitoring if you take it.

Repeat, follow-on and what comes next

• Tests taken inside the window period routinely need repeating.
• Inadequate or unclear samples sometimes need retaking.
• A positive screening test may need a confirmatory test before treatment.
• If symptoms persist or evolve, reassessment and further tests are normal.

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, named route to get results and ask questions.
• Honest window-period advice and a retest plan where needed.
• Prompt treatment and a test-of-cure where appropriate.
• Confidential, supportive partner notification.
• Signposting to free NHS services, vaccination and HIV prevention.

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 a free NHS service or pay for a private assessment.
• Appointment length and whether an examination is included.
• Which infections are tested for, including any extra or site-specific tests.
• Whether any tests are rapid same-day tests.
• Treatment, confirmatory tests or a test-of-cure if a result is positive.
• Follow-up appointments and confidential partner-notification support.

• The clinician or service fee for the assessment.
• The exact list of infections tested for, and laboratory fees.
• Whether examination, advice and prevention are included.
• What a positive result triggers, and at what cost.
• Cost of repeat or window-period retesting.
• Cost of any treatment, vaccination or prevention medicine.
• A reminder that the same care is free on the NHS.

On the NHS? STI assessment and testing are free and confidential on the NHS for everyone, including through sexual health services; some people choose private care for speed, but you never have to pay to look after your sexual health.

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.

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.

How Vuemedics verifies every consultant →

Take this to your consultation. A good specialist will welcome every one of these.

• Based on my symptoms and history, which infections are you testing for?
• Given when I last had sex, is it too early to test — and when should I retest?
• Do I need throat or rectal samples as well as urine or blood?
• Could my symptoms have a cause other than an STI?
• How and when will I get my results, and what happens if one is positive?
• Would HIV prevention (PrEP) or vaccination be sensible for me?
• 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?

Find a verified specialist for sexually transmitted infection assessment

Every consultant is GMC-checked and independently reviewed. Search by postcode and distance, or switch to a map. Ordered by rating, relevance and recency — never by who pays.

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) NHS — Visiting a sexual health clinic BASHH — Summary guidance on STI testing (2023) Terrence Higgins Trust — Testing for HIV NHS — Find STI testing and treatment

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.