Cancer staging tests (Cancer staging investigations)
The scans, tests and pathology used to work out the size of a cancer and whether it has spread, so the right treatment can be planned.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Staging tests work out the size of a cancer and whether it has spread, so treatment can be planned; they do not predict exactly what will happen.
- It usually combines several tests (scans, biopsy and blood tests), and the results are discussed by a multidisciplinary team (MDT).
- No single scan is perfect: tests can miss small disease, and unrelated 'incidental' findings are common.
- Staging is routinely done on the NHS; private testing may be used for speed or choice but should join up with your NHS team.
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.
Works out how far the cancer has spread, which guides treatment choices
A particular scan is the wrong test for your cancer type; your team chooses based on the diagnosis.
You have scans, blood tests and sometimes a biopsy, often over more than one appointment. Most are outpatient and you go home the same day.
Results brought together and discussed by a multidisciplinary team (MDT).
You have scans, blood tests and sometimes a biopsy, often over more than one appointment. Most are outpatient and...
After most scans you can return to normal activity. After a biopsy or sedation, you may need rest, a lift home...
Results usually take days to a couple of weeks, as scans are reported and tissue is examined.
Your results are brought together and discussed by a team of specialists who agree the stage and treatment options.
What are cancer staging investigations?
Staging investigations are the tests, scans and pathology used to find out how big a cancer is and whether it has spread. The result is usually described as a 'stage'. Knowing the stage helps your cancer team plan the most suitable treatment and explain what to expect.
Many cancers are described using the TNM system: T for the size of the tumour, N for whether nearby lymph nodes are affected, and M for whether the cancer has spread to another part of the body. This is often turned into a number stage from 1 to 4, where stage 1 is usually small and contained and stage 4 usually means it has spread to another organ. The grade (how abnormal the cells look) is separate from the stage.
Staging usually combines several tests: scans such as CT, MRI or PET-CT; sometimes a biopsy or further tissue tests; and blood tests. No single test gives the whole picture, and the results are usually brought together and discussed by a multidisciplinary team (MDT) of specialists.
Staging tells you and your team where things stand at one point in time. It cannot predict exactly what will happen, and the stage can occasionally change once surgery or further tests give more information. The aim is to plan care carefully, not to provide a definite forecast.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
CT vs MRI vs PET-CT for staging
| CT | MRI | PET-CT | |
|---|---|---|---|
| Main use | Overview, spread | Soft-tissue detail | Active disease |
| Speed | Quick | Slower | Half-day |
| Radiation | Yes | No | Yes |
| Contrast | Often dye | Sometimes dye | Tracer injection |
Your team chooses tests based on your cancer type. They are often used together, not as alternatives, and the choice is a clinical decision.
Preparing for your test
- Ask your team which tests you need, what each one is for, and when results are expected.
- Tell staff if you are or might be pregnant, as some scans use radiation.
- Mention kidney problems, diabetes or any previous reaction to contrast dye before scans that use it.
- Tell staff about any metal implants, a pacemaker or claustrophobia before an MRI.
- Follow any fasting or preparation instructions, for example before a PET-CT or some biopsies.
- Bring a list of your medicines, including blood thinners, especially before a biopsy.
- Arrange transport if you will have sedation for a biopsy or endoscopy.
What happens
Staging usually involves several appointments rather than one. For scans, you lie still while the machine takes pictures; some scans involve an injection of contrast dye or a radioactive tracer, and some need fasting beforehand. Most scans are usually not painful, though lying still or the dye can be uncomfortable.
A biopsy takes a small sample of tissue, often using local anaesthetic and sometimes guided by a scan. Blood tests check your general health and organ function. You can usually go home the same day.
The results from all the tests are brought together and discussed by a multidisciplinary team (MDT) of specialists, who agree the stage and the recommended treatment options. Your cancer doctor or nurse then explains the findings and what they mean for your care.
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…
- A particular scan is the wrong test for your cancer type; your team chooses based on the diagnosis.
- You cannot safely have a scan or contrast (for example certain implants, severe kidney problems, or pregnancy) without adjustment.
- A biopsy site is too risky to access, so a different approach is needed.
- Repeating tests would add risk or worry without changing the plan.
Delay or rearrange if…
- You may be pregnant and a scan uses radiation; this needs checking first.
- You have an active infection or are unwell in a way that makes a biopsy riskier.
- You are on blood thinners that need managing before a biopsy.
- Key earlier results are not yet available to guide which staging tests are needed.
Alternatives to discuss
- A different scan that avoids radiation or contrast where appropriate.
- Watchful monitoring before further tests in selected, low-risk situations.
- A less invasive test instead of a biopsy where the diagnosis is already clear.
- Reviewing existing scans rather than repeating them, where possible.
- The standard NHS staging pathway rather than separate private tests.
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
- Works out how far the cancer has spread, which guides treatment choices
- Helps your team recommend the most suitable treatment for your situation
- Provides a baseline to compare against during and after treatment
- Can identify whether treatment might aim to cure or to control the cancer
- Helps you understand your situation and ask better questions
Risks & complications
- Discomfort from lying still, an injection, contrast dye or a biopsy
- Anxiety while waiting for scans and results
- Incidental findings: unrelated things picked up that may need further tests
- Needing more than one test, or a repeat test, to get a clear answer
- Bruising, bleeding or infection at a biopsy site
- A reaction to contrast dye, usually mild
- An unclear or 'inconclusive' result that needs further investigation
- Understaging or overstaging if disease is too small to see or is misjudged
- A serious allergic reaction to contrast dye
- Significant bleeding or organ injury from a biopsy
- A staging result later found to be inaccurate once surgery or further tests are done
No staging test is perfect. Scans can miss very small areas of disease, and incidental findings can lead to extra tests and worry. Biopsies carry small risks of bleeding and infection, and contrast dye can rarely cause reactions. Ask your team how confident they are in the stage, whether any test could change the plan, and what happens if a result is unclear.
Published figures to discuss
The accuracy of staging, and the chance of false positives, false negatives, incidental findings or inconclusive results, varies widely by cancer type, the test used and the stage of disease. Reliable single figures cannot be given for 'staging' as a whole, and no scan is perfect, so results are interpreted together by the MDT rather than relying on one test.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Incidental findings on staging scans | Common | Scans often show unrelated cysts, nodules or benign changes that may need clarification. | Guide sourcesClinical context |
| Microscopic spread missed by imaging | Core limitation | CT, MRI and PET can miss very small disease; pathology and follow-up still matter. | Guide sourcesClinical context |
| Contrast or radiation exposure | Test-dependent | CT and PET use ionising radiation; contrast decisions consider kidney function and allergy history. | Guide sourcesClinical context |
| Stage changes after surgery or biopsy | Recognised | Final pathology can upstage or downstage disease compared with pre-treatment imaging. | 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 usually little or no physical recovery from staging tests, though biopsies and sedation need short aftercare. The harder part is often waiting for results, which are usually discussed at an MDT meeting before being explained to you.
- Feeling tired or anxious during the waiting period
- Mild soreness or bruising after a biopsy that settles in a few days
- A short period of rest after sedation before returning to normal activity
- Needing the results explained more than once to take them in
- Learning that further tests are needed before a final stage is clear
Aftercare
- Follow any biopsy-site care instructions and watch for signs of bleeding or infection.
- If you had sedation, do not drive, sign important documents or drink alcohol for the rest of the day.
- Drink plenty of fluids after a scan with contrast dye, if advised.
- Keep a note of which tests you have had and when results are due.
- Write down questions for your results appointment.
- Bring someone with you to the results discussion if you can.
- Tell your team about any new symptoms while you wait for results.
- A list of your medicines, including blood thinners, before a biopsy
- Transport arranged if sedation is planned
- Notes on any contrast or metal-implant issues for the scan team
- A written list of questions for your results appointment
- A trusted person to attend the results discussion
- Contact details for the team in case of side effects after a biopsy
⚠ Get urgent help if…
- Heavy or persistent bleeding from a biopsy site
- Increasing pain, redness, swelling, heat or discharge at a biopsy site (signs of infection)
- A temperature of 38C or above after a biopsy
- Breathlessness, chest pain or coughing up blood after a chest or lung biopsy
- Rash, swelling of the face or lips, or difficulty breathing after contrast dye
- Severe abdominal pain after a biopsy of an internal organ
- Feeling faint, very unwell or confused
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' from staging is a clear picture of the size of the cancer and whether it has spread, so your team can recommend the most suitable treatment. The stage is usually described using the TNM system or a number from 1 to 4.
Staging shows where things stand at one point in time. It cannot say exactly what will happen, and the stage can occasionally change once surgery or further tests give more information. A normal scan does not always rule out very small disease, which is why your team interprets all the tests together rather than relying on one.
Staging gives a snapshot, and its usefulness fades as your situation changes. Scans may be repeated during and after treatment to see how the cancer is responding and to check for any change. Your team will advise how often repeat imaging or tests are needed.
Related tests, treatments or support
Staging investigations are usually done as a group, with scans, biopsy and blood tests interpreted together. They feed into decisions about treatment, clinical trials and supportive care, and provide the baseline used for later surveillance and follow-up.
Follow-up & long-term care
Your results are usually discussed at an MDT meeting before your cancer doctor or nurse explains the stage and the recommended plan. If a result is unclear, you may need further tests. Once treatment starts, repeat scans and tests are used to monitor how the cancer responds.
Repeat, follow-on and what comes next
- Staging can change once surgery or further tests provide more information.
- An inconclusive scan or biopsy may mean a repeat or a different test.
- Incidental findings can lead to extra investigations.
- Repeat scans are often used during and after treatment to monitor response.
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
- Results brought together and discussed by a multidisciplinary team (MDT).
- A clear explanation of the stage and what it means for your options.
- A plan for any further tests if results are unclear.
- Biopsy-site and contrast aftercare advice, with a contact for problems.
- Results shared with your GP and cancer team, and a baseline kept for future comparison.
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:
- Which scans and tests are needed (CT, MRI, PET-CT, biopsy, blood tests).
- Whether contrast dye or a tracer is used.
- Whether a specialist reports the scans the same day.
- Whether a biopsy or image-guided procedure is required, and any sedation.
- The number of appointments and follow-up consultations to discuss results.
- Whether results need to be transferred to or reviewed by another team.
- Which specific tests are included and the fee for each
- Whether contrast, tracer or biopsy costs are included
- Whether specialist reporting and a results consultation are included
- What happens, and what extra cost there is, if further or repeat tests are needed
- How results will be shared with your GP and cancer team
- What happens if a biopsy is inconclusive or a complication occurs
On the NHS? Staging investigations are routinely provided on the NHS once cancer is diagnosed or strongly suspected; private testing may be used for speed or choice but should coordinate with your NHS team.
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 being told that scans can miss small disease or pick up unrelated findings.
- No clear explanation of contrast or biopsy risks before the test.
- Assuming a normal scan rules out all cancer or all spread.
- Not knowing who will see the results and when they will be discussed.
- Having tests privately without a plan to share results with your NHS team.
Marketing red flags
- Claims that a single scan 'catches everything' or rules out all cancer.
- Selling whole-body scans as a guaranteed way to stage or detect cancer.
- Promising same-day certainty without acknowledging that tissue tests and MDT review take time.
- Downplaying the risk of incidental findings and extra tests.
- Encouraging repeated private scanning without clear clinical benefit.
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 staging tests do I need, and what is each one for?
- When will the results be ready, and will they be discussed at an MDT meeting?
- How confident are you in the stage, and could any test change the treatment plan?
- What happens if a result is unclear or shows something unexpected?
- Will I need repeat scans during or after treatment?
- What does my stage mean for my treatment options, including trials?
- 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
What does the stage of my cancer mean?
Why do I need so many different tests?
How long will I wait for results?
Can the stage change later?
Are these tests available on the NHS?
What if a scan finds something unrelated?
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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: Cancer Research UK — Stages of cancer Macmillan Cancer Support — Staging and grading NHS — Tests and scans for cancer (CT scan) NHS — PET scan Cancer Research UK — Cancer grades NICE — Lung cancer: diagnosis and staging (example guidance)
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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