How long does a colonoscopy take?

How long does a colonoscopy take?

There is no single fixed figure. For many people the colonoscopy itself takes around half an hour, while the whole clinic visit usually fills a couple of hours, and preparation at home starts in the days beforehand. Below is a realistic picture of the timings so you can plan your day. The specific times for diet, bowel preparation and medication are stated in the instructions you receive from the clinic, and those apply rather than general figures.

Quick answer

Phase	Time
Diet preparation	Seed- and fibre-free diet from 3 days before, as per the clinic's instructions
Bowel prep at home	According to your personal preparation instructions
Total clinic visit	Typically a couple of hours, varies
The colonoscopy itself	Often around 20–30 minutes, can be longer
Recovery after sedation	Individual, until you are assessed as ready
Recovery at home	Varies from person to person

The procedure itself

For many people the scope is inside the bowel for around 20–30 minutes, but this is not a guarantee. The doctor passes the scope through the colon, inspects again as the scope is withdrawn, and selected polyps can be removed along the way. Not every polyp or lesion can necessarily be removed at the same examination; larger or complex findings may require a separate procedure or referral. The examination is intended to reach the whole colon, but it can be incomplete depending on bowel preparation, anatomy, tolerability and technical factors. If the anatomy is difficult, the procedure takes longer and a supplementary examination may be needed.

The full clinic visit

Although the procedure itself is short, allow longer at the clinic. The visit includes arrival and a short conversation, the colonoscopy, a period of observation if you have had sedation, and a review of the findings. How long the observation lasts is assessed individually.

Sedative and pain-relieving medication is planned together with the clinician based on your needs, your health and the extent of the procedure. It is neither purely a patient choice nor something everyone receives.

Preparation at home

Preparation starts before the examination, and its extent is adapted individually:

• diet preparation: as per the clinic's instructions, a seed- and fibre-free diet from 3 days before the examination
• bowel preparation: follow the clinic's handed-out instructions with Dulcolax for three days and Picoprep the day before at 2 pm and 8 pm, unless your appointment letter says otherwise
• fluids and fasting on the day: the times are in your instructions and depend among other things on your appointment time and any sedation
• medication: there is no general rule about pausing or continuing regular medication. Anticoagulants and antiplatelet drugs, diabetes medication, insulin, GLP-1 agonists and iron supplements are assessed individually, and the prescribing doctor may need to be involved. Never stop or change prescribed medicine without a specific agreement with your treating doctor

How quickly the preparation works, and how long it lasts, differs from person to person. Plan to stay close to a toilet while it is working.

Recovery after the colonoscopy

How quickly you feel yourself again varies, and it depends among other things on sedation, on whether polyps were removed and on how you feel. Plan a quiet rest of the day and follow the instructions you are given:

• if you have had intravenous sedation, then for 24 hours you must not drive, cycle, operate machinery, drink alcohol, sign legally binding documents or make important decisions, and an adult must accompany you home
• if you have not had sedation, driving and work depend on your symptoms and on the specific instructions you are given
• if polyps were removed, you receive individual instructions about activity, heavy work and any precautions regarding medication

What affects the timing?

• Bowel anatomy. A long or tortuous colon takes longer to examine
• Previous abdominal surgery. Adhesions can make it harder to pass the scope
• Polyps. Number, size and location affect both time and technique
• Sedation. Requires observation after the procedure
• Quality of the bowel preparation. A poorly cleaned colon means extra time to wash and inspect

Do I need to take a whole day off?

Plan at least to take the day of the examination off. For most people the preparation the day before is demanding enough that it is hard to combine with work. How quickly you can return to work, driving and operating machinery depends on sedation, on the extent of the procedure and on the individual instructions you are given. We therefore cannot promise that everyone is back to normal the next morning.

When to seek urgent help

Call 112 for heavy or continuing rectal bleeding, breathing problems, severe chest pain or chest pain with breathlessness, fainting or reduced consciousness. For severe or increasing abdominal pain, a hard and distended abdomen, fever or vomiting after the examination, contact the out-of-hours medical service (1813 in the Capital Region) or the nearest emergency department the same day. A planned clinic appointment does not replace urgent assessment.

Ready to go further?

Read the full patient guide to colonoscopy for the whole process step by step, or the separate guide to the low-residue diet before colonoscopy if you are looking for the specific meal plan.