This is usually done as an out-patient or day case procedure. It is a routine test which is commonly done under sedation to help you relax. A flexible tube (endoscope) is slowly inserted through the anus (back passage) and used to examine the lining of the large intestine, colon and rectum. Sometimes samples (biopsies) are taken for diagnosis and /or treatment. Photos can be taken and included in your report/diagnosis. These procedures can be undertaken with the use of sedation and or Entonox.