A colonoscopy is an investigative technique used to examine the entire length of the large bowel. It involves the insertion of a long, flexible tube with a camera, which includes lighting, irrigiation and insufflation systems, into the anus through to the rectum and colon.
![](https://iconspecialistcentre.hk/wp-content/uploads/2019/11/Colonoscopy-Graphic-500x500.jpg)
A colonoscopy is useful in diagnosing ulcers, polyps and cancers. Using different accessory instruments, it can be used to both diagnose and treat a range of conditions through procedures such as biopsy (taking a tissue sample for further examination), polypectomy (removal of polyps), endoscopic dissection (removal of larger lesions), haemostasis and stenting (to relieve obstruction).
![](https://iconspecialistcentre.hk/wp-content/uploads/2019/11/Polypectomy-Graphic-500x500.jpg)