What is Flexible Sigmoidoscopy?
Flexible sigmoidoscopy is an endoscopic procedure that examines the inside of the lower portion of the large bowel, specifically the sigmoid colon and rectum. It uses a shorter, flexible tube with a camera and light (sigmoidoscope) inserted through the rectum.
Unlike a full colonoscopy, flexible sigmoidoscopy does not examine the entire colon. It is a valuable tool for investigating symptoms localised to the lower bowel and rectum, and is often performed with less sedation or even without sedation in some patients.
When is Flexible Sigmoidoscopy Recommended?
- Rectal bleeding investigation
- Assessment of haemorrhoids or rectal polyps
- Chronic diarrhoea or altered bowel habits focused in the lower bowel
- Rectal pain or unexplained anal or rectal symptoms
- Surveillance of inflammatory proctitis or left-sided colitis
- Investigation of abnormalities detected on imaging in the sigmoid/rectum
- Screening adjunct in some populations
What Happens During the Procedure?
Bowel Preparation
An enema is administered shortly before the procedure to clear the lower bowel. Full bowel prep as required for colonoscopy is usually not needed.
Positioning & Scope Insertion
You lie on your side. The sigmoidoscope is gently inserted through the rectum and advanced into the sigmoid colon.
Examination
The specialist carefully examines the bowel lining on withdrawal. Biopsies can be taken as needed.
Post-Procedure
The procedure is usually brief. If no sedation is used, you can drive yourself home. Results are discussed immediately after.