Before the procedure begins, the patient lies on the left side and bends the legs. The doctor applies a special gel to the flexible endoscope, carefully inserts the instrument through the anal canal, and gradually advances it through the rectum and sigmoid colon. The camera transmits an image of the mucous membrane to the monitor.
For better visibility, a small amount of air is introduced into the intestine. Because of this, a feeling of pressure, bloating, or a short-term urge to defecate may occur.
During the examination, the doctor may take a tissue sample for histological analysis. If a polyp is detected, if possible, it is immediately removed and sent for examination.
The examination usually lasts 10–20 minutes. In most cases, general anesthesia is not required, but according to individual indications, the procedure may be performed with sedation. After the examination is completed, the doctor explains the results and determines further treatment tactics.