Colonoscopy in Singapore: Early Detection & Peace of Mind
Medically reviewed by:
Dr Tan Wah Siew
Senior Consultant Colorectal Surgeon
MBBS (Singapore), MMed (Surgery), FAMS, FRCS
Dr Lee Ser Yee
Senior Consultant Hepatopancreatobiliary Surgeon
MBBS (Singapore), MMed (Surgery), MSc (Research), FAMS
Colorectal cancer is one of the most common cancers in Singapore and often develops without early symptoms. A colonoscopy allows early detection and the removal of precancerous polyps in a single procedure, helping to reduce the risk of cancer before symptoms appear.
What Is a Colonoscopy?
A colonoscopy is a procedure used to examine the lining of the rectum and colon. Under sedation,
a flexible tube called a colonoscope is gently inserted through the anus and guided through the
colon. The colonoscope is fitted with a small camera that provides high-definition images,
allowing the doctor to examine the bowel lining in detail.
If any abnormalities or polyps are found, they can be removed during the same procedure and sent
for biopsy to check for abnormal cells.
Benefits of Colonoscopy Screening
- Detects colorectal cancer at an early stage, often before symptoms develop
- Allows precancerous polyps to be identified and removed during the same procedure
- Improves treatment outcomes through early intervention
- Provides a complete view of the colon for accurate diagnosis
Signs You May Need a Colonoscopy
You may be advised to undergo a colonoscopy if:
1
You have symptoms such as blood in the stools, changes in bowel habits, abdominal discomfort or unexplained weight loss
2
You have no symptoms but are above 50 years of age, when colorectal cancer risk increases
3
You have no symptoms but have a family history of colorectal cancer or familial adenomatous polyposis coli (FAP)
4
You have a personal history of colorectal polyps or inflammatory bowel disease
What Conditions Is Colonoscopy Commonly Used to Detect?
A colonoscopy allows doctors to examine the colon and rectum for a range of conditions, including:
- Colorectal Polyps and Colorectal Cancer – Polyps are abnormal growths in the colon that can develop into cancer if left untreated.
- Diverticular Disease – This occurs when small pouches form in the colon wall and may become inflamed or infected.
- Ulcerative Colitis and Crohn’s Disease – These are forms of inflammatory bowel disease that cause long-term inflammation of the digestive tract.
- Sources of lower gastrointestinal bleeding – Colonoscopy may be used to identify causes such as bleeding polyps, angiodysplasia or areas of inflammation.
Colonoscopy also plays a role in ongoing surveillance and monitoring for certain colorectal conditions, depending on individual risk factors and clinical findings.
Preparing for a Colonoscopy
Proper preparation allows a clear view of the colon and reduces the need for repeat procedures. Patients are usually advised to:
- Follow Dietary Restrictions – Switch to a low-fibre or clear-liquid diet one to two days before the procedure.
- Complete Bowel Cleansing – Take the prescribed bowel preparation exactly as instructed to fully clear the colon.
- Adjust Medications, If Advised – Temporarily stop or modify certain medicines, such as blood thinners, according to your doctor’s instructions.
- Stay Well Hydrated – Drink plenty of clear fluids during preparation to prevent dehydration.
- Observe Fasting Instructions – Stop eating and drinking for the specified period before the procedure.
What to Expect on the Day of the Colonoscopy
On the day of the procedure, you will be asked to lie on your left side. Sedation is given before the colonoscopy begins to ensure comfort. Throughout the examination, your heart rate, blood pressure and oxygen levels are closely monitored. Most patients sleep through the procedure and do not remember it once they wake up.
What to Expect after a Colonoscopy Procedure
After the procedure, you will be taken to a recovery area where you will rest until you are fully awake. As the
effects of sedation can linger, you will need to arrange for someone to take you home and should avoid driving
for the rest of the day.
It is common to experience mild abdominal bloating for 24 to 48 hours due to air introduced during the
examination. You may also notice fewer bowel movements over the next few days, as the bowel has been emptied
during preparation. These effects usually resolve on their own as your body returns to its normal rhythm.
Call 6454 0054 to make an enquiry or book an appointment.
Colonoscopy Safety and When to Contact Your Doctor
A colonoscopy is generally a safe procedure when performed by an experienced and accredited doctor. Serious complications are uncommon, but may include bleeding or bowel perforation.
Contact your doctor promptly if you experience:
- Severe or worsening abdominal pain
- Persistent bleeding from the rectum
- Fever or chills
- Dizziness or weakness
Choosing a Specialist for Your Colonoscopy
Selecting an appropriate specialist is an important part of preparing for a colonoscopy. Factors to consider
include the clinician’s training and experience in colorectal conditions, access to modern endoscopic techniques
and the availability of coordinated care before and after the procedure.
At Surgical Associates, Dr Tan Wah Siew and Dr Lee Ser Yee perform colonoscopy as part of the assessment and
management of colorectal conditions. Their practice includes the use of minimally invasive and advanced
endoscopic techniques where appropriate, along with structured follow-up to support recovery and ongoing
colorectal health. Schedule an appointment at our clinic today to discuss your assessment needs.
Frequently Asked Questions About Colonoscopy Procedures
For individuals at average risk, colonoscopy screening usually begins at around 50 years of age and is repeated every 10 years if no abnormalities are found. Those with higher risk factors, such as a family history of colorectal cancer or certain medical conditions, may be advised to start screening earlier or undergo more frequent examinations.
Without regular screening, colorectal cancer or precancerous polyps may go undetected until symptoms develop. By this stage, the disease may be more advanced and treatment options can be more limited.
If the bowel is not adequately prepared, stool may obscure the view of the colon lining, making it harder to detect polyps or other abnormalities. In some cases, the procedure may need to be repeated or rescheduled. Following the preparation instructions carefully helps improve accuracy and reduce the need for repeat examinations.
If no biopsy is taken, results are often discussed shortly after the procedure. When tissue samples are collected, biopsy findings are usually available within several days to one week, depending on laboratory processing.
Yes, most patients are advised to arrange for someone to accompany them home after the colonoscopy procedure, as sedation can cause temporary drowsiness or impaired judgement. Your doctor will provide guidance on when it is safe to resume normal activities.
