Colonoscopy is the internal examination of the colon and rectum by a colonoscope (a long, flexible tube about half an inch in diameter with a camera attached to the end), to evaluate symptoms of the colon (eg. Rectal bleeding, change in bowel habits and persistent abdominal pain), or to screen asymptomatic individuals who are at risk of colon cancer.
It can detect ulcers, inflammed tissue and abnormal growths in the walls of the colon.
Preparing for a Colonoscopy
For successful visualization of the colon and rectum, the bowel must be clean and free of accumulated faeces. It is thus very important that you follow the instructions for preparing your bowel, given by your doctor. Without proper preparation, the colonoscopy may not be successful and may have to be repeated.
The Colonoscopy
You will be given a pain reliever and some sedation, so that you will be relaxed and comfortable. You may be asleep during the colonoscopy or be unable to remember it following the procedure. You will be made to lie on your side with your knees drawn up towards your chest, and your doctor will pass the well lubricated colonoscope into your anus, gently guiding it through the rectum and into the colon. Small amounts of air will be pumped in to expand the colon for proper visualization of the colon walls.
Your doctor can remove growths, called polyps during the colonoscopy, and later send it to the laboratory to test for signs of cancer. Polyps are common and usually benign, however, most colorectal cancers begin as polyps, so they should always be tested.
Biopsies can also be taken from abnormal looking tissues in the walls of the colon. If bleeding occurs following biopsy or removal of polyps, it can be stopped via diathermy (an electrical probe) passed through the colonscope.
The entire procedure lasts about 30 minutes to an hour.
Following The Colonoscopy
You may be required to remain at the clinic for 1 to 2 hours after the procedure to allow time for the sedative to wear off. Cramping, bloating and passing of flatus (gas) is common following a colonoscope due to the air pumped in during the procedure.
You should contact your doctor if you have any of the following rare side effects:
Severe abdominal pain
Blood in your stools
Dr Ang C.D. is has been in medical practice for over 12 years. He graduated with an M.B.B.S. degree from the National University of Singapore in 1997 and subsequently completed his post-graduate diploma in Family Medicine.
He has had training in Emergency Medicine, Internal Medicine, Geriatric Medicine, Orthopaedic Surgery, Obstetrics & Gynaecology, Neurosurgery, General Surgery, Colorectal Surgery and Urology.
Dr Ang currently practices in a family clinic in Singapore, seeing a good mix of paediatric, adult and geriatric patients.
With the goal of providing local and international patients with a resource for specialist care in Singapore, Dr Ang has founded SingaporeDoc.com, a Web Directory of Specialists in Private Practice in Singapore.
http://singaporedoc.com
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