High-risk surgery review (Anaesthetic high-risk / fitness-for-surgery review)
An anaesthetist-led assessment that works out how well your body is likely to cope with a planned operation, so you and your team can make a careful, shared decision about whether and how to go ahead.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- It is an anaesthetist-led assessment of how well you are likely to cope with surgery, not a treatment.
- It is not a simple pass or fail — it gives you and your surgeon information for a shared, honest decision, and may sometimes advise against operating.
- It often gives you time to get fitter and to sort out things like anaemia, blood pressure or diabetes before the operation.
- Being told you are higher-risk does not mean you cannot have surgery; it means the plan and aftercare are tailored to you.
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.
Gives you a clearer, more personalised picture of your risk than guesswork or history alone.
Detailed elective risk assessment is not appropriate when an operation is a genuine emergency — urgent treatment comes first.
Questions, examination and any tests. A CPET takes only a few minutes of cycling plus set-up time.
A clear, written summary of your risks, the plan, and any optimisation steps.
Questions, examination and any tests. A CPET takes only a few minutes of cycling plus set-up time.
You can usually leave and resume normal activities. After CPET you simply rest until your breathing settles.
Results are often discussed at the appointment or shortly after, and shared with your surgical team.
If an optimisation or prehabilitation plan is agreed, you work on it in the weeks leading up to the operation.
What is a high-risk / fitness-for-surgery review?
A high-risk or fitness-for-surgery review is a careful look, usually led by an anaesthetist, at how well your heart, lungs and general health are likely to stand up to a planned operation and the recovery afterwards. It brings together your medical history, your medicines, blood tests, a heart tracing (ECG) and sometimes a fitness test on an exercise bike (called cardiopulmonary exercise testing, or CPET).
The point of the review is not to put you through hoops. It is to give you and your surgeon honest, personalised information so you can decide together whether surgery is the right choice, and to plan the safest way to do it — including whether you might need a high-dependency or intensive-care bed afterwards.
Importantly, this review can also help you. If something can be improved before surgery — blood pressure, anaemia, diabetes control, fitness, smoking — the team can put a plan in place. Occasionally the review may advise waiting, choosing a smaller procedure, or not operating at all if the risks outweigh the likely benefit.
It is an assessment, not a treatment. It does not fix anything on its own, and a reassuring result is not a guarantee that surgery will go smoothly.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Fitness review vs going straight to surgery
| Issue | With a fitness review | Without |
|---|---|---|
| Risk picture | Personalised, objective where CPET used | Based on history alone |
| Chance to improve health first | Yes, if time allows | Limited |
| Aftercare planning (HDU/ICU) | Planned in advance | Decided later |
| Time and appointments | Extra visit(s) | Fewer steps |
For major surgery, a review is normal NHS practice; the trade-off is mainly an extra appointment or two.
Preparing for your test
- Bring an up-to-date list of all your medicines, including inhalers, blood thinners, supplements and anything bought over the counter.
- Tell the team if you take any weight-loss or diabetes injection or tablet such as semaglutide (Ozempic, Wegovy, Rybelsus) or tirzepatide (Mounjaro) — one of a group known as GLP-1 or GLP-1/GIP medicines — even if you obtained it privately or online. These can slow how quickly your stomach empties, so food or fluid may still be present despite fasting, which matters for a safe anaesthetic. Do not stop them on your own; the anaesthetic team will assess you individually and advise whether and when to pause them.
- Bring details of your medical conditions and any recent hospital letters or test results.
- Be ready to describe honestly how much you can do day to day — stairs, hills, walking distance — as this helps estimate your fitness.
- If a CPET (exercise bike) test is planned, wear comfortable clothes and flat shoes, avoid nail varnish, and ask whether to take your usual medicines that day.
- Tell the team about chest pain, breathlessness, blackouts, or any new or unstable symptoms before the appointment.
- Write down your own questions, including what matters most to you about recovery and quality of life.
- If you smoke, drink heavily, or could lose some weight, ask what support is available — even small changes before surgery can help.
What happens
You will usually be seen in a pre-assessment or perioperative clinic. A nurse or doctor goes through your health and medicines, and an anaesthetist may examine you and review your test results such as blood tests and an ECG.
If a CPET is arranged, you cycle on a static bike for roughly 5–12 minutes while wearing a mask that measures the oxygen you use and the carbon dioxide you breathe out, with your heart rhythm and blood pressure monitored. It starts gently and gets gradually harder, and staff can stop it at any time. It is supervised throughout and is not a pass-or-fail test.
The team then puts the picture together: your fitness, your conditions, and the size of the planned operation. They discuss what this means for your risk, whether anything should be improved first, and whether you might need close monitoring in a high-dependency or intensive-care bed afterwards.
This information is shared with the surgeon who is treating you, and with you, so a plan can be agreed together. Nothing should go ahead until you understand and agree with it.
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…
- Detailed elective risk assessment is not appropriate when an operation is a genuine emergency — urgent treatment comes first.
- A CPET may not be suitable or safe for everyone (for example unstable heart disease or limited mobility); the team will choose other ways to judge fitness.
- It is the wrong step if the real need is treatment of an acute condition rather than planning elective surgery.
- It cannot, on its own, decide whether surgery is right — that is a shared decision with your surgeon.
Delay or rearrange if…
- You have an active infection or a new, unstable symptom such as chest pain or breathlessness that needs sorting first.
- Important results or letters are missing.
- Your usual medicines, especially blood thinners or diabetes treatment, have not been reviewed.
- Your health has changed since you were listed, so an older assessment may no longer apply.
Alternatives to discuss
- Standard nurse-led pre-assessment without formal exercise testing, where that is enough.
- Choosing a smaller or less invasive procedure after discussion.
- Conservative or non-surgical management of the underlying problem.
- Watchful waiting, with surgery reconsidered if things change.
- A second opinion from another anaesthetist or surgeon.
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
- Gives you a clearer, more personalised picture of your risk than guesswork or history alone.
- Supports a genuine shared decision about whether and how to have surgery.
- Identifies things that can be improved beforehand, which may lower your risk.
- Helps the team plan the right anaesthetic and the right level of aftercare, including HDU or ICU if needed.
- Can reassure you, or prompt a safer alternative, before you are committed to a major operation.
Risks & complications
- It is mostly information-gathering, so direct physical harm is unlikely.
- An extra appointment or two, and some waiting for results.
- The exercise test can feel tiring or breathless while you are doing it.
- Finding a higher risk than expected can be worrying.
- Tests may turn up unexpected findings that need their own follow-up.
- Surgery may be delayed while something is treated or investigated.
- The review may advise a different or smaller operation, or none at all.
- Very rarely, the exercise test brings on chest pain, an abnormal heart rhythm or faintness — which is exactly why it is supervised and stopped early if needed.
The biggest 'risk' of this review is emotional: being told you are higher-risk, or that surgery may not be wise, can be hard to hear. That information is there to protect you, not to refuse you care. Ask the anaesthetist what your particular risks are, what can be improved, and what would happen if you chose not to have the operation.
Published figures to discuss
This review measures and predicts risk rather than causing it, so there are few procedure-specific complication rates. The figures that matter are about surgery and anaesthesia overall, and they vary widely by your health, your fitness and the operation planned. CPET helps estimate, but cannot perfectly predict, how an individual will do.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Serious medical complications in high-risk surgical patients | Around 1 in 3 high-risk patients who choose major surgery (CPOC) | An estimate used to highlight why honest, shared decisions matter; it varies greatly by patient and procedure and is not a figure for this assessment itself. | MHRA — GLP-1/GIP medicines and anaesthesia (aspiration risk)gov.ukPublished figure |
| Death caused directly by anaesthesia | Estimated about 1 in 200,000 anaesthetics in the UK (RCoA) | Very rare, and one part of overall surgical risk; your personal risk depends on your health and the operation. | RCoA — Your anaesthetic for major surgery (HDU/ICU)rcoa.ac.ukPublished figure |
| Post-operative delirium or loss of independence | Common in older, frail or emergency major-surgery patients | High-risk assessment should include cognition, frailty, rehabilitation and what outcome the patient would consider worthwhile. | MHRA — GLP-1/GIP medicines and anaesthesia (aspiration risk)gov.ukSource-linked context |
| Risk estimate changing after optimisation or further tests | Expected | Anaesthetic review may reduce risk, clarify risk or show that a different treatment path is safer. | MHRA — GLP-1/GIP medicines and anaesthesia (aspiration risk)gov.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 usually nothing to recover from. You can normally go straight back to your day, including after a CPET, once you have caught your breath.
- Feeling tired or breathless for a short while after the exercise test.
- Having more questions once you have had time to think.
- Waiting a little for results or for a follow-up plan.
- Mixed feelings if the news is more cautious than you hoped.
Aftercare
- Follow any plan to improve your health before surgery, such as exercise, stopping smoking or treating anaemia.
- Take your usual medicines as advised, and check which to pause before the operation.
- Keep any follow-up appointments or repeat tests.
- Ask for the risk information in writing if that helps you decide.
- Tell the team promptly if your health changes before the operation.
- Use the time to ask anything you did not get to, including about aftercare and recovery.
- Up-to-date medicines list ready
- Recent hospital letters and results gathered
- Your own questions written down
- Comfortable clothes and flat shoes if a CPET is planned
- A note of how far/fast you can usually walk or climb stairs
- Contact number for the clinic saved
⚠ Get urgent help if…
- New or worsening chest pain or pressure before your operation — seek urgent medical help.
- New or worsening breathlessness, especially at rest or lying flat.
- Blackouts, fainting or a racing, irregular heartbeat.
- Signs of infection or feeling generally unwell while waiting for surgery.
- Any sudden change in your health — tell your surgical and anaesthetic team promptly, as the plan may need to change.
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' result usually means your fitness and health suggest you are likely to cope reasonably well with the planned operation and recovery, and that a safe plan can be made. It does not guarantee a smooth operation or recovery — no test can do that.
A more cautious result does not automatically mean 'no'. It often means more careful planning, optimisation first, a smaller procedure, or a frank discussion about whether the likely benefit is worth the risk. The aim is a decision that is right for you.
Fitness and health can change, so a review reflects how you are around the time it is done. If your operation is delayed by months, or your health changes, some assessment or tests may need repeating so decisions are based on an up-to-date picture.
Related tests, treatments or support
This review often sits alongside standard pre-operative checks, the surgeon's consent discussion, and prehabilitation or 'surgery school'. For some operations it is combined with specialist input from cardiology, respiratory or elderly-care medicine.
Follow-up & long-term care
Results are fed back to you and to your surgical team, and used to agree a plan. You may be given an optimisation plan to follow, asked to return for repeat tests, or referred to another specialist. If surgery goes ahead, the findings shape your anaesthetic and aftercare.
- Keep working on any agreed fitness, weight, smoking or nutrition goals up to the operation.
- Keep long-term conditions such as diabetes and blood pressure as well-controlled as you can.
- Update the team if your medicines or health change before surgery.
Repeat, follow-on and what comes next
- Assessments and tests may need repeating if surgery is delayed or your health changes.
- A result can be inconclusive, leading to further tests or specialist referral.
- The plan may be revised — for example optimising first, choosing a smaller operation, or deciding not to operate.
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, written summary of your risks, the plan, and any optimisation steps.
- A named route to ask questions before the operation.
- Results shared promptly with you and your surgical team.
- A defined plan for the right level of monitoring after surgery (ward, HDU or ICU).
- Support to act on improvements such as fitness, smoking, anaemia or blood-sugar control.
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 review is a clinic appointment only or also includes exercise testing (CPET).
- Which tests are added — ECG, echocardiogram, lung-function tests or blood tests.
- The seniority and specialty of the clinician (consultant anaesthetist, cardiologist, etc.).
- Whether results are reported and discussed the same day.
- Whether a written risk summary or report is provided.
- Any follow-up appointments, repeat tests or referral to another specialist.
- The clinician's fee for the assessment and who will carry it out.
- Which tests are included and which cost extra (CPET, echo, lung-function, bloods).
- Whether a written report and risk summary are included.
- Facility or test-unit fees.
- What happens, and what it costs, if further tests or referrals are needed.
- Whether a follow-up discussion of results is included.
- Cancellation and rebooking policy.
On the NHS? Pre-operative and high-risk assessment is a standard part of NHS care before major surgery; private review is mainly used for speed, choice or a second opinion, and does not change the underlying clinical advice.
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 review as a rubber stamp rather than a genuine shared decision.
- Presenting a 'pass' as a guarantee that surgery will be safe.
- Not explaining what would happen without surgery, or what alternatives exist.
- Not giving the risk information in a form you can take away and think about.
- Pressing ahead before unstable symptoms or missing results are dealt with.
Marketing red flags
- Claims that a fitness test 'clears' you for surgery or removes risk.
- Selling CPET or extra scans as a box-tick rather than because they will change your plan.
- Downplaying the option of not operating.
- Pressure to book surgery quickly off the back of a single test result.
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.
- Based on my health and fitness, what do you think my main risks are for this operation?
- Is there anything I can improve before surgery that would lower my risk?
- Will I need a high-dependency or intensive-care bed afterwards?
- What would happen if I chose not to have the operation, or to have a smaller one?
- Do I need a CPET or other tests, and what will they actually change?
- Who will I see on the day, and how will this plan be passed on to them?
- 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 this available on the NHS or only privately?
Does a high-risk result mean I can't have my operation?
What is the exercise bike test (CPET) like?
Will the review delay my surgery?
Can the review actually make my surgery safer?
What if I disagree with the advice?
I take a weight-loss or diabetes 'GLP-1' medicine (such as Ozempic, Wegovy or Mounjaro) — does it affect 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 — Your anaesthetic for major surgery (HDU/ICU) RCoA — Preparing for surgery (Fitter Better Sooner) CPOC — Assessment, optimisation and shared decision making CPOC — Shared decision making North Bristol NHS Trust — Cardiopulmonary exercise testing (CPEX) NICE NG45 — Routine preoperative tests for elective surgery MHRA — GLP-1/GIP medicines and anaesthesia (aspiration risk)
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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