Pre-operative assessment clinic
An appointment before planned surgery to check your health, plan the safest anaesthetic and make sure you are as well prepared as possible for your operation.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- A pre-operative assessment checks you are fit for surgery and an anaesthetic, and plans the safest approach for you.
- It is also where you get clear instructions on medicines, fasting and preparation, and where you can ask questions.
- Sometimes it finds a problem that should be improved or investigated first, which can mean a short delay to keep you safe.
- Being honest about your health, medicines and habits, and preparing well beforehand, helps your recovery.
- If you take a weight-loss or diabetes injection such as semaglutide (Wegovy, Ozempic) or tirzepatide (Mounjaro), tell the team even if you bought it privately — it can affect your anaesthetic and fasting, and you should not stop it without their advice.
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.
Helps make your operation and anaesthetic as safe as possible by spotting and managing risks early
There is no reason to skip a pre-operative assessment before planned surgery; it is a safety step rather than an optional extra.
Your health is reviewed, measurements and any tests are done, and your anaesthetic and preparation are discussed.
Clear, written instructions on medicines, fasting and what to do on the day.
Your health is reviewed, measurements and any tests are done, and your anaesthetic and preparation are discussed.
Some results, such as blood pressure and ECG, are available straight away. You go home with instructions about...
Blood tests and swab results come back. If anything needs action, the team contacts you or your GP.
Any further tests, medicine changes or health improvements are completed. You should know your operation date and...
What is a pre-operative assessment clinic?
A pre-operative assessment is an appointment that happens after surgery has been planned but before the day of your operation. Its job is to check that you are fit enough for the operation and the anaesthetic, to spot anything that needs sorting out first, and to plan the safest possible anaesthetic for you.
It is often run by specially trained nurses, who take your medical history, check things like your blood pressure, weight and height, and arrange tests such as blood tests, a heart tracing (ECG) or swabs. If you have more complex health problems, you may also be seen by an anaesthetist, who plans your anaesthetic and discusses the options and risks with you.
The appointment is also your chance to ask questions, understand what to expect, and get clear instructions on medicines, eating and drinking, and how to prepare. Preparing well, sometimes called getting "fitter, better, sooner", can genuinely help your recovery.
Sometimes the assessment finds that surgery should wait until a health problem is better controlled, or that another test or opinion is needed first. That is the clinic doing its job: making your operation as safe as it can be.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Options at a glance
These are the main approaches described in this guide. The right option depends on the diagnosis, your goals and what your clinician thinks is safe.
Nurse-led assessment
The most common type. A trained nurse reviews your health and medicines, does basic checks and arranges any tests. Most people who are otherwise well are seen this way.
Anaesthetist review
If you have more complex health problems, you may also see an anaesthetist to plan your anaesthetic, discuss options and risks, and decide whether more tests are needed.
Tests and investigations
Depending on your health and the operation, this may include blood tests, a heart tracing (ECG), MRSA swabs, blood pressure, weight and height, and occasionally heart or lung...
Telephone or online assessment
For straightforward, lower-risk operations, part of the assessment may be done by phone or an online questionnaire, with a clinic visit only if needed.
Preparing for your appointment
- Bring an up-to-date list of all your medicines, including prescription, over-the-counter, herbal and supplement products, with doses.
- If you use a weight-loss or diabetes injection such as semaglutide (Wegovy, Ozempic) or tirzepatide (Mounjaro), tell the team — including any you have obtained privately or online — as these medicines affect your anaesthetic and fasting plan.
- Bring any clinic letters about ongoing conditions, such as heart, lung, kidney or diabetes care.
- Know your medical history, including past operations, anaesthetic problems and any family history of anaesthetic reactions.
- Be ready to talk honestly about smoking, alcohol, recreational drugs and your usual activity level — this affects your safety, not your judgement.
- Note any allergies and how you react to them.
- Write down questions you want to ask about your anaesthetic, pain relief or recovery.
- Bring details of next of kin and, if relevant, who will care for you after surgery.
- Allow enough time, as the appointment can take up to a couple of hours if tests are needed.
What happens
You will usually be asked detailed questions about your general health, past operations, current medicines, allergies and lifestyle. The clinician checks key measurements such as blood pressure, heart rate, oxygen levels, weight and height.
Depending on your answers and the operation planned, tests may be arranged on the same day, such as blood tests, a heart tracing (ECG), or swabs to check for bacteria like MRSA. Some people need extra heart or lung tests.
If your health is more complex, an anaesthetist may review you, talk through the type of anaesthetic likely to suit you, explain the main risks and benefits, and answer your questions. You will get instructions about which medicines to keep taking, change or stop, and clear guidance on fasting (when to stop eating and drinking before surgery).
By the end, the team aims to confirm whether you are ready for surgery, sort out anything that needs improving, and make sure you know what happens next. Occasionally they advise waiting until a health problem is better managed.
Is this appointment 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…
- There is no reason to skip a pre-operative assessment before planned surgery; it is a safety step rather than an optional extra.
- For very minor procedures under local anaesthetic, a full clinic visit may not be needed, but a basic health check usually still happens.
- It is not a substitute for the consent discussion about the operation itself, nor for emergency assessment if you become acutely unwell.
Delay or rearrange if…
- You have a current infection, such as a chest infection, cold or urine infection, which may need treating first.
- A long-term condition such as diabetes, blood pressure or heart failure is poorly controlled.
- Important results or specialist letters are missing.
- You are, or might be, pregnant, which needs discussing before some operations and anaesthetics.
Alternatives to discuss
- A telephone or online assessment for straightforward, lower-risk operations.
- A more detailed anaesthetist-led clinic for people with complex health problems.
- Reviewing whether the operation is needed at all, or whether a non-surgical option is reasonable.
- Postponing surgery to allow time to get fitter or to treat a health problem first.
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
- Helps make your operation and anaesthetic as safe as possible by spotting and managing risks early
- Lets the team plan an anaesthetic suited to you and your health
- Gives you clear instructions on medicines, fasting and preparation so the day of surgery runs smoothly
- Identifies things you can improve beforehand, such as fitness, smoking, weight, diabetes control or anaemia
- Reduces the chance of your operation being cancelled at the last minute
- Gives you a chance to ask questions and feel more in control
Risks & complications
- The minor discomfort of a blood test, and the time the appointment takes
- Feeling anxious when risks are discussed honestly
- Being asked to make changes before surgery, such as stopping smoking or adjusting medicines
- Being advised to delay surgery until a health problem is better controlled
- Needing further tests or a specialist opinion before going ahead
- A previously unknown health problem being picked up, which needs investigating
- Being advised that the planned operation carries too much risk for you at present, prompting a rethink of options
- An incidental finding on a test that leads to unexpected worry or further tests
This is an assessment, not a treatment, so it carries very little physical risk. Its purpose is to reduce the risks of your operation. The main downsides are practical: it takes time, and occasionally it leads to a delay or further tests. If surgery is delayed, ask exactly what needs to improve, how long it should take and who will help you get there.
Published figures to discuss
A pre-operative assessment is an appointment, not a treatment, so meaningful complication rates do not apply to the assessment itself. What it does is estimate and reduce the risks of your future operation and anaesthetic. Those risks depend heavily on your health, the operation and the type of anaesthetic, and are discussed individually rather than as a single figure.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Anaesthetic or surgical plan changing after assessment | Common | The clinic is meant to identify risks early, optimise them and sometimes choose a safer anaesthetic or treatment path. | MHRA — Semaglutide (Wegovy, Ozempic, Rybelsus): risk of NAIONgov.ukSource-linked context |
| Surgery delayed for optimisation or missing information | Uncommon but appropriate when risk is modifiable | Examples include anaemia, uncontrolled blood pressure, unstable heart/lung disease, diabetes control or anticoagulant planning. | MHRA — Semaglutide (Wegovy, Ozempic, Rybelsus): risk of NAIONgov.ukSource-linked context |
| Medication error around surgery | Recognised preventable risk | Anticoagulants, diabetes medicines, steroids, Parkinson's medicines and herbal supplements need explicit instructions. | MHRA — Semaglutide (Wegovy, Ozempic, Rybelsus): risk of NAIONgov.ukSource-linked context |
| Undetected frailty, sleep apnoea, delirium risk or poor support at home | Common enough to screen for in higher-risk patients | Good pre-assessment covers recovery and discharge, not just the anaesthetic on the day. | MHRA — Semaglutide (Wegovy, Ozempic, Rybelsus): risk of NAIONgov.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 assessment itself. What matters afterwards is acting on the instructions you are given and getting any results or further tests sorted before your operation.
- No physical after-effects beyond a possible small bruise from a blood test
- A clear set of instructions to follow before surgery
- Waiting a few days for some test results
- Sometimes being asked to make a change, such as adjusting a medicine
- Feeling more informed, though possibly a little anxious, about the operation
Aftercare
- Follow the instructions you are given about which medicines to continue, change or stop.
- Follow the fasting instructions exactly on the day of surgery, as eating or drinking when you should not can mean cancellation for safety.
- Make any agreed health improvements, such as stopping smoking or improving fitness, in the time you have.
- Attend any further tests or appointments arranged before your operation.
- Let the team know if your health changes before surgery, for example a new cough, cold, infection or chest pain.
- Arrange practical support for after the operation, such as a lift home and help at home if needed.
- Keep the contact details you are given in case you have questions before the day.
- Your medicine instructions written down (what to continue, change or stop)
- Clear fasting instructions for the day of surgery
- Dates for any further tests or appointments
- A plan for getting fitter or stopping smoking if advised
- A lift home and help at home arranged for after surgery
- A contact number for questions before the operation
- Your operation date and where to go on the day
⚠ Get urgent help if…
- A new fever, cough, cold or chest infection before your operation — tell the team, as surgery may need to wait
- New or worsening chest pain, breathlessness or palpitations
- A new infection, wound or skin problem near the planned operation site
- Confusion about which medicines to take or stop, or about fasting — always check rather than guess
- Any new symptom you are worried about between the assessment and surgery
- If you take a weight-loss or diabetes injection such as semaglutide (Wegovy, Ozempic) or tirzepatide (Mounjaro): severe, ongoing tummy pain, often spreading through to your back and with feeling or being sick, needs urgent medical assessment — it can be a sign of pancreatitis (inflammation of the pancreas). Stop the injection and get seen straight away rather than waiting.
- If you take semaglutide (Wegovy, Ozempic or Rybelsus): sudden painless loss of part or all of the vision in one eye, or eyesight that is quickly getting worse, needs immediate assessment at an eye casualty or A&E.
- If you become unwell enough to need urgent care, seek it and let the surgical team know
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 good outcome is a clear plan: confirmation that you are fit to proceed, an anaesthetic plan suited to you, and instructions you understand. Sometimes the result is that something needs improving or investigating first, which is the assessment working as intended.
Being passed as fit for surgery does not remove all risk; every operation and anaesthetic carries some. The assessment lowers and plans for those risks rather than abolishing them, and you will normally have a separate, fuller consent conversation about the operation and the anaesthetic themselves.
Assessment results are a snapshot of your health at that time. If there is a long gap before surgery, or your health changes, some checks may need repeating closer to the operation. Always tell the team if you become unwell after your assessment.
Related tests, treatments or support
The pre-operative assessment sits alongside your surgical consent discussion and your meeting with the anaesthetist (sometimes on the day of surgery). Together these cover the operation, the anaesthetic, pain relief and recovery. Any optimisation, such as stop-smoking support or treatment for anaemia, runs in parallel.
Follow-up & long-term care
If the assessment is straightforward, the next contact is usually the day of surgery. If tests or changes are needed, the team or your GP will follow up to make sure everything is sorted in time. You should know who to contact if you have questions before then.
- Keep up any agreed changes, such as stopping smoking or improving fitness, right up to surgery
- Continue managing long-term conditions, such as diabetes or blood pressure, as advised
- Tell the team about any change in your health before the operation
Repeat, follow-on and what comes next
- Plans can change: an assessment may lead to more tests, medicine changes or a short delay.
- Some checks may need repeating if there is a long gap before surgery or your health changes.
- The anaesthetic plan made in clinic may be adjusted on the day by the anaesthetist looking after you.
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
- Clear, written instructions on medicines, fasting and what to do on the day.
- A named contact for questions between the assessment and surgery.
- A plan for any further tests, optimisation or specialist input, with timescales.
- Joined-up communication with your GP where health problems need managing.
- A separate, unhurried consent discussion about the operation and the anaesthetic.
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 the assessment is nurse-led or also includes an anaesthetist review
- Which tests are needed, such as blood tests, ECG, or heart and lung tests
- The complexity of your health and the operation planned
- Whether any further tests or specialist opinions are required before surgery
- Whether the assessment is bundled into an overall surgical package or charged separately
- Whether the pre-operative assessment is included in your overall surgical and anaesthetic package or charged separately
- Which tests are included and which might be charged extra
- Whether an anaesthetist review is included if your health is more complex
- What happens, clinically and financially, if surgery is delayed or further tests are needed
- Who to contact with questions before the day of surgery
On the NHS? A pre-operative assessment is a standard part of NHS surgical care and is also carried out before private operations; it is not usually a separate, self-pay service in its own right.
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
- Treating the assessment as the full consent conversation for the operation or anaesthetic, which should be separate and detailed.
- Not giving clear, written instructions about medicines and fasting.
- Not explaining why a delay or further test is needed, or how long it should take.
- Not making clear that being passed as fit reduces but does not remove the risks of surgery.
Marketing red flags
- Implying that paying privately removes the need for proper assessment or lets you skip safety checks.
- Suggesting an operation can go ahead with no assessment to save time.
- Charging for an elaborate screen of tests that national guidance would not recommend for your situation.
- Glossing over fasting and medicine instructions as unimportant.
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.
- What type of anaesthetic is likely to suit me, and why?
- Which of my medicines should I keep taking, change or stop, and when?
- When exactly should I stop eating and drinking before surgery?
- Is there anything I should do now to be in better shape for the operation?
- Do I need any further tests or a specialist opinion before going ahead?
- Who do I contact if my health changes or I have questions before the day?
- 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 appointment, 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 appointment 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
Why do I need a pre-operative assessment?
Will I see the anaesthetist who does my operation?
Could my operation be cancelled because of this?
What tests will I have?
Do I need this before a private operation too?
How should I prepare?
I take a weight-loss or diabetes injection such as Wegovy, Ozempic or Mounjaro. Does it matter for my anaesthetic?
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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: RCoA — Preparing for surgery (patient information) RCoA — Fitter Better Sooner RCoA — You and your anaesthetic NHS — Anaesthesia NICE — Routine preoperative tests for elective surgery (NG45) MHRA — GLP-1/GIP receptor agonists: acute pancreatitis warning MHRA — Semaglutide (Wegovy, Ozempic, Rybelsus): risk of NAION MHRA — GLP-1/GIP receptor agonists: pulmonary aspiration under anaesthesia/sedation
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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