Colonscopy is the examination of the entire colon, from the rectum to the caecum, and may include the examination of the terminal ileum
Proctosigmoidoscopy is the examination of the rectum and sigmoid colon
Sigmoidoscopy is the examination of the entire rectum, sigmoid colon and may include examination of a portion of the descending colon
Letter prefix Y - Office or hospital visits on same day - extra to procedure fee