Your doctor will use a flexible, lighted tube to check the rectum and the lower part of the colon. This test does not require any anesthesia or sedation; however, sedation will be provided if requested. It does require limited preparation such as an enema, please click here to read about the necessary preparation. Insertion of the tube may be somewhat uncomfortable, and some cramping may occur during the procedure, which takes about ten minutes. After the test, there may be some mild abdominal gas pains. If the doctor took a biopsy, some traces of blood may be in the stool for a few days. This test is recommended every five years beginning at age 50 for people at average risk. If you receive sedation you must be accompanied to the procedure.