How I decide when you need another colonoscopy
I check the number, size and type of polyps, whether they were completely removed and how clearly I could examine the bowel. Previous polyps, family history and your health also affect the recommendation.
I use New Zealand surveillance guidance alongside these findings. An early check of a removal site has a different purpose from a later examination for new polyps. I record the recommendation in your endoscopy and/or histology report once the tissue results are available.
In some circumstances, the interval I recommend may not meet the eligibility criteria for publicly funded surveillance colonoscopy. Public services prioritise available capacity, and these criteria can change as resources change; that may not be the same as the interval I consider best for your individual risk. If this affects you, we can discuss the reasons and available options.
Why an overseas follow-up timetable may differ
New Zealand, American and European guidelines do not recommend identical intervals after every polyp finding. They weigh the evidence differently, particularly for small, lower-risk polyps. An overseas timetable may therefore differ from the recommendation in your New Zealand report without either report describing a different polyp.
What guides your next examination?
What was removed
The number, size and type of polyps and any dysplasia help determine follow-up. A polyp result is not interpreted in isolation.
What was removed
The number, size and type of polyps and any dysplasia help determine follow-up. A polyp result is not interpreted in isolation.
The whole examination
I check removal completeness, the quality of the bowel preparation and whether the whole colon could be examined.
Your previous history
Previous polyps, family history, health and suitability for further procedures also guide the recommendation.
Different reasons to return
A removal-site check, routine surveillance and assessment of new symptoms have different purposes. Your report explains which applies to you.
Simplified illustrations, not to scale. These show an example, not your own anatomy or test result.
Read every diagram explanation
What was removed
The number, size and type of polyps and any dysplasia help determine follow-up. A polyp result is not interpreted in isolation.
The whole examination
I check removal completeness, the quality of the bowel preparation and whether the whole colon could be examined.
Your previous history
Previous polyps, family history, health and suitability for further procedures also guide the recommendation.
Different reasons to return
A removal-site check, routine surveillance and assessment of new symptoms have different purposes. Your report explains which applies to you.
What does follow-up mean?
Another colonoscopy may be recommended for different reasons. Your report explains which applies to you.
| Option | What I am checking |
|---|---|
| Removal-site or scar check | Whether any tissue remains or has regrown after a large or complex polyp was removed. |
| Routine surveillance | Whether further polyps have developed elsewhere in the bowel. |
| New symptoms | A new clinical concern. Please get in touch rather than waiting for your surveillance date. |
How the tissue result changes follow-up
A pathologist examines the removed tissue under a microscope. The histology report identifies the polyp type, such as an adenoma or a serrated lesion, and describes any abnormal cell changes.
Dysplasia means abnormal cells within the lining. Low-grade and high-grade describe the degree of change. High-grade dysplasia is more advanced than low-grade dysplasia, but is not the same as invasive cancer. If cancer is found, I will explain a separate treatment and follow-up plan.
The result is interpreted alongside the number and size of the polyps. One larger polyp or several smaller polyps may lead to different advice. The word benign alone does not tell us the surveillance interval.
What I check during colonoscopy
I consider whether each polyp was completely removed, how clearly the bowel lining could be seen and whether the colonoscopy reached the beginning of the large bowel, called the caecum.
If preparation was not clear enough, some areas may need another look. If the examination could not be completed, I will explain whether another colonoscopy or a different test is needed. This is different from routine surveillance after a complete examination.
A biopsy only samples tissue. It does not always remove a whole polyp. Your endoscopy report records what was removed, what was sampled and whether further treatment is planned.
Why might I need an earlier scar check?
A large or complex polyp may be removed in pieces, called piecemeal removal. An earlier examination can check the healing site for any remaining or recurrent polyp tissue. If tissue is found, further treatment may be possible during that check.
This site check is different from a later examination looking for new polyps throughout the bowel. You may need both. An early appointment does not by itself mean cancer was found. The timing depends on the lesion, removal technique and results.
How does my history affect the recommendation?
I review polyps from previous examinations as well as the latest findings. Tell me about bowel cancer or significant polyps in your family, including which relatives were affected and their ages at diagnosis.
A large number of polyps, a young age at diagnosis or a concerning family history may need a separate assessment. People with a hereditary bowel condition, inflammatory bowel disease or previous bowel cancer can have different follow-up arrangements.
Your age, general health and ability to tolerate another examination are also part of the decision. Surveillance is recommended when its expected benefit justifies the preparation and procedure for you. More frequent colonoscopy is not automatically better.
Can I use FIT instead?
FIT checks a poo sample for blood. Some precancerous polyps do not bleed, so a negative FIT cannot show that the bowel is clear of polyps.
If I have recommended a surveillance colonoscopy or an early check of the removal site, FIT does not replace it. Some people with lower-risk findings can return to routine screening when eligible. I make that recommendation after checking the polyp findings, how clearly I could see the bowel and your history. Follow the plan documented in your report.
Where will my follow-up be recorded?
Your recommended follow-up will be documented in your endoscopy report and/or histology report once the tissue results are available. An early discussion may need to be updated when histology is complete.
Please get in touch with me if your expected result or appointment has not arrived, or you are unsure about the next step. You are welcome to arrange a consultation to discuss the findings or ongoing symptoms. If an offered appointment is unsuitable, I will do my best to accommodate your needs.
When to get urgent help after removal
Seek urgent medical assessment for heavy or ongoing bleeding, blood clots, black tarry stools, severe or worsening abdominal pain, fever, repeated vomiting, or feeling faint or very unwell. Follow your discharge advice, including your individual medicine instructions.
Call 111 if you collapse, have heavy bleeding with faintness or are too unwell to travel safely.
Three things to remember
- Your next colonoscopy depends on the polyps found, whether they were fully removed, how clearly the bowel was seen and your history.
- An early scar check and later surveillance have different purposes.
- A negative FIT does not replace an advised colonoscopy.
Related information
Sources and further reading
English clinical master checked 15 October 2026.