If you are planning to undergo a colonoscopy in Singapore, you should know that bowel preparation is just as important as the procedure itself. A clean bowel allows your specialist to detect small growths or polyps clearly.
On the other hand, poor preparation can cause bowel obstruction, leading to missed findings, a longer procedure, or even the need to repeat the test.
Not sure where to start or what to expect? Don’t worry – this checklist explains step-by-step preparation for the days leading up to your colonoscopy, from diet changes to the final checklist on the day of the appointment.
Why Preparation for Colonoscopy Matters
A colonoscopy is a procedure that allows a colorectal specialist to examine the inside of your large intestine (colon) using a thin, flexible tube with a camera.
Colonoscopy is often recommended to check for conditions such as:
- Colorectal cancer – a common cancer in Singapore; early detection improves treatment options.
- Polyps – small growths that may turn cancerous over time if left untreated; many can be removed during the procedure.
- Unexplained bleeding – helps identify the source of gastrointestinal bleeding that may not be visible externally.
- Persistent abdominal pain – ongoing discomfort, cramping, or bloating that does not improve with routine care.
- Changes in bowel habits – such as prolonged diarrhoea, constipation, or alternating patterns.
The success of the test depends on how clear your bowel is. Here’s what happens if your bowel is not well-prepared:
Here’s what happens if your bowel is not well-prepared:
- The camera may not capture clear views.
- Polyps or small growths can be missed.
- The procedure may need to be rescheduled.
Good preparation helps you avoid repeat tests, lowers your risk of complications, and gives you peace of mind with accurate results.
Think you need a colonoscopy? Schedule a consultation at Dr Bernard Lim Surgery to find out more.
#1: One Week Before Your Colonoscopy
Preparation starts earlier than most people think. About a week before your appointment, you should:
- Review your medications – Tell your doctor if you take blood thinners, diabetes medicines, or iron supplements. These may need to be adjusted.
- Reduce high-fibre foods – Cut back on nuts, seeds, beans, raw vegetables, and whole grains. These can remain in the bowel longer and cause obstructions.
- Stay hydrated – Drink plenty of water daily. Being well-hydrated will make the cleansing process easier later.
- Avoid alcohol and smoking – Both can irritate your digestive system and slow healing.
#2: Shopping List for Colonoscopy Prep Days
Having the right foods at home will make the process smoother. It is recommended that you stock up on:
- Clear liquids: water, clear juices, clear broths, coconut water, sports drinks, plain tea, or black coffee.
- Electrolyte solutions: oral rehydration drinks to replace salts lost during prep.
- Simple snacks: clear jelly, honey, or hard candies (avoid red, blue, or purple colouring as they may cause stains in the bowel).
- Comfort items: wet wipes, soft toilet paper, and soothing cream for skin relief.
#3: 48 to 24 Hours Before: Final Prep Phase
This is when you’ll switch your diet and begin bowel cleansing. In this phase, you should:
- Eat low-residue foods: plain rice, pasta, white bread, fish, or chicken. Avoid vegetables, fruit skins, beans, and seeds.
- Move to clear liquids: About 24 hours before the colonoscopy, stop all solid food. Only take clear liquids.
- Start your bowel prep solution: Follow the instructions given. Many patients find the split-dose method (half the night before and half the morning of) more effective.
#4: The Night Before the Colonoscopy
This stage is usually the most intense as it’s the final one before the procedure. Here’s what you should do:
- Take your bowel cleansing solution: Be prepared for multiple trips to the toilet. This shows the solution is working.
- Stay near a bathroom: The urge can come suddenly, so make sure you are at home.
- Use comfort aids: Wet wipes and skin balm can ease irritation at the anus.
- Keep drinking clear liquids: Alternate water or broth with the prep solution to stay hydrated.
#5: Day of the Colonoscopy
On the morning of your colonoscopy, you should:
- Avoid eating solid food. Stick to clear liquids if allowed, and follow the fasting instructions provided.
- Complete the prep solution if you are on a split dose.
- Only take approved medications. Avoid over-the-counter supplements unless cleared by your doctor.
- Wear comfortable clothes. Loose, easy-to-change outfits are best.
- Arrange transport. As you will be sedated during the procedure, you should not drive home. Ask someone to accompany you or arrange a taxi.
Looking for a Colonoscopy Doctor in Singapore?
If you are over 50, have symptoms like persistent abdominal pain, or have a family history of colorectal cancer, a colonoscopy can provide clarity and peace of mind.
Dr Bernard Lim, an experienced colorectal specialist in Singapore, combines minimally invasive techniques with personalised care to make your procedure safe and comfortable. He will guide you through every step — from preparation and the colonoscopy itself to treatment options in Singapore if necessary.
Take charge of your digestive health. Book an appointment today.
