What is the procedure of injecting fluid into the large intestine through the rectum known as?

The procedure of injecting fluid into the large intestine through the rectum is known as an enema. This method is primarily used for a variety of medical purposes, including relieving constipation, preparing for medical examinations such as colonoscopies, or administering medication.

An enema involves introducing a fluid solution, often saline or medicated liquid, into the rectum and colon to stimulate a bowel movement or help cleanse the bowel for an upcoming procedure. This technique is valuable in both diagnostic and therapeutic contexts, making it an important practice in healthcare settings.

In contrast, a colonoscopy refers to a procedure where a flexible tube with a camera is inserted into the colon to view its interior, and sigmoidoscopy is similar but focuses only on the sigmoid colon and rectum. Urethrography involves imaging the urethra and is unrelated to procedures involving the colon or rectum.