To prepare for a flexible sigmoidoscopy you will be given an enema 30 minutes before the test to clear stool from the rectum and lower colon.  Because only the lower part of the colon is examined the preparation is much easier than for a colonoscopy where the entire colon needs to be clean. 

A flexible sigmoidoscopy uses much the same equipment as a colonoscopy test but the camera is only passed to the lower part of your colon (usually to the descending colon).  The examination is quicker and much less uncomfortable than a colonoscopy and typically takes only 5 minutes.  Most people choose to do the test awake without sedation – however, if you would prefer to sleep for the test, deep sedation can be arranged. 

A thin camera – it is about the thickness of a little finger – is then passed into the anus with plenty of lubrication.  During the test, the camera is passed gently into the lower part of the colon.  Tissue samples or biopsies may be taken during the test to give further information – this is a painless and very safe procedure.   

After the test, you may experience some trapped gas and bloating although most people have no symptoms at all.  Passing gas after the test can help get rid of any excess air and bloating. 

You will go home after the test.  If you have been given sedation you should not drive home yourself and should get home with a friend or relative or in a taxi.