What Is a Colonoscopy?

A colonoscopy is a minimally invasive procedure in which a gastroenterologist inserts a thin, flexible camera (colonoscope) into the colon via the rectum to examine the large intestine for polyps, colorectal cancer, inflammation, or bleeding sources. It is both a diagnostic and therapeutic tool — polyps can be removed during the same procedure (polypectomy), significantly reducing colorectal cancer risk.

Colorectal cancer is Singapore's most common cancer in men and second-most common in women. Colonoscopy screening is the most effective way to detect it early, when it is most treatable.

Colonoscopy vs. Other Screening Tests

TestWhat It DetectsHow OftenNotes
ColonoscopyPolyps + cancer (visual + biopsy)Every 10 yearsGold standard; allows polyp removal
FIT (Faecal Immunochemical Test)Blood in stoolEvery 1–2 yearsNon-invasive; positive result requires colonoscopy
CT ColonographyStructural abnormalitiesEvery 5 yearsNo polyp removal; radiation exposure
Flexible SigmoidoscopyLower colon onlyEvery 5 yearsMisses right-sided lesions

The Procedure: Step by Step

1
Bowel Preparation (1–2 days before): You'll follow a low-residue diet and take a laxative preparation (e.g., Moviprep, Plenvu) to fully cleanse the colon. This is the most uncomfortable part of the process for most patients.
2
Admission & Sedation: Arrive at the day surgery/hospital. An IV line is inserted. Sedation (midazolam or propofol) is administered — you will be drowsy or fully asleep.
3
The Colonoscopy (20–45 minutes): The colonoscope is gently inserted and advanced through the colon. Air or CO₂ is used to inflate the colon for better visibility. Any polyps found are removed immediately.
4
Recovery (1–2 hours): You'll recover in a supervised area as the sedation wears off. You'll need someone to drive you home — you cannot drive yourself after sedation.
5
Results & Follow-Up: The gastroenterologist discusses preliminary findings immediately. Biopsy results take 5–7 working days. Polyp pathology determines your next screening interval.

Colonoscopy Cost in Singapore

SettingWithout PolypsWith PolypectomyMedisave Claim
Public Hospital (Class B2/C, subsidised)$300–$700$500–$1,200Yes (after subsidy)
Public Hospital (Class A/B1, unsubsidised)$1,000–$1,800$1,500–$2,500Yes
Day Surgery Centre (private)$800–$1,500$1,200–$2,200Yes
Private Hospital$1,500–$2,500$2,000–$4,000+Yes

*Costs include gastroenterologist fee, anaesthetist fee, hospital/facility fee, and standard pathology. Includes GST. Prices as of 2026.

Medisave Coverage

Colonoscopy is a Medisave-claimable procedure (MediShield Life Scheduled Procedure). You can use Medisave to pay for:

  • Day surgery fee (up to the prevailing MOH withdrawal limit)
  • Specialist consultation fee (subject to limits)
  • Anaesthetist fee
  • Pathology/biopsy fees

For a straightforward diagnostic colonoscopy, many patients pay little to nothing out-of-pocket after Medisave, especially at public hospitals.

Frequently Asked Questions

Find a specialist
Compare gastroenterologists in Singapore

See our researched shortlist: subspecialty focus, credentials and clinic websites, checked against public records.

View the shortlist →

The procedure itself is performed under sedation, so you will not feel pain during it. Some patients experience mild bloating or cramping afterward as the air used during the procedure passes out. Using COâ‚‚ instead of air (offered at many centres) reduces this significantly. Bowel preparation the night before can cause cramping and discomfort.

Most people return to normal activities the next day. You'll spend 1–2 hours recovering in the clinic after the procedure. You cannot drive on the day of the procedure due to sedation. Light bloating and gas for several hours post-procedure is normal. If polyps were removed, you'll receive specific dietary instructions (usually a soft diet for 24 hours).

Singapore Cancer Society recommends colonoscopy screening beginning at age 50 for average-risk individuals, every 10 years. If you have a first-degree relative with colorectal cancer, start at age 40 (or 10 years before the relative's diagnosis age, whichever is earlier) and screen every 5 years. Symptoms like rectal bleeding, unexplained weight loss, or change in bowel habits warrant immediate investigation regardless of age.

Blood thinners (warfarin, aspirin, clopidogrel) typically need to be stopped 5–7 days before if polypectomy is anticipated. Diabetic medications may need adjustment. Iron supplements should be stopped 1 week before (they interfere with bowel prep). Always inform your gastroenterologist of all medications — they'll provide a specific pre-procedure medication plan.

A referral is not strictly required for private specialist consultations in Singapore, but having one from a GP or polyclinic may help with insurance claims. For Medisave claims for day surgery, a specialist's clinical indication is required. Many patients self-refer to private gastroenterologists for colonoscopy screening.