Colonoscopy is inspection of the inner surface of the large bowel (colon) with a lighted, camera-tipped device. The success of the procedure depends directly on how clean the bowel is. Insufficient preparation can cause polyps and early cancer lesions to be missed and can require repeat procedures.
What to eat and avoid
| Timing | Diet |
|---|---|
| 3 days before | Cut out whole grains, seeds, dried fruit, raw vegetables, corn, sesame |
| 2 days before | Move to low-fibre foods: white bread, rice, eggs, chicken, potato, banana |
| 1 day before | Clear liquids only: water, unsalted broth, weak tea, strained apple juice |
| Procedure day | Continue clear liquids; stop drinking 4–6 hours before as advised |
How to use the preparation
Your doctor's prescribed preparation is usually taken in a 'split dose': part the evening before, the remainder about 4–6 hours before the procedure. The 2023 ESGE update highlights this approach as preferred, improving diagnostic accuracy.
Procedure day
- You should not drive after sedation — arrange for someone to accompany you
- Avoid jewellery and heavy make-up
- Bring a list of your regular medications
- Tell your doctor beforehand if you take diabetes, blood-thinner or blood pressure medication
Notes for patients on medication
- Blood thinners (aspirin, clopidogrel, warfarin, DOACs) — plan with your doctor
- Iron tablets — may need to stop 5–7 days before
- Diabetes medications — doses may need to be adjusted during fasting
This content is for general information only. For personal diagnosis and treatment decisions please consult your doctor. For emergencies, contact the nearest medical facility.
Frequently Asked Questions
What happens if the bowel is not fully cleaned?
Is drinking water also forbidden?
Will I feel pain during colonoscopy?
Yararlanılan Kaynaklar
- ESGE — Bowel Preparation for Colonoscopy Guideline Update 2023
- ASCRS — Clinical Practice Guidelines (Colorectal)
- NHS — Bowel cancer, Diverticular disease, IBS
- Sağlık Hizmetlerinde Tanıtım ve Bilgilendirme Faaliyetleri Hakkında Yönetmelik
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