Flexible Sigmoidoscopy is a procedure that doctors use to examine the rectum and lower colon. A flexible tube 60 cm long and about the thickness of your little finger, the flexible sigmoidoscope is inserted slowly into the anus and advanced slowly into the rectum and the lower colon. This is a simple and accurate method of examining the cause of change in bowel habit, rectal bleeding, rectal pain and diarrhea. Flexible sigmoidoscopy is also part of the screening for colon cancer surveillance.
The rectum and lower colon must be completely clean of stool. The doctor will give you instructions on how to clean your colon. Generally speaking, the preparation may require one or two enemas, a laxative and changes to your diet. In certain cases, such as the presence of constant diarrhea, the preparation may be waived.