This document highlights five medical abbreviations and acronyms related to the genitourinary system: GU, which refers to the urinary and reproductive systems combined. It discusses reasons for catheterization like after surgery or for critically ill patients, which involves inserting a sterile tube into the bladder to drain urine. It also covers urinary tract infections caused by bacteria entering the urinary system, and chronic and acute renal failure, which are the gradual or sudden loss of kidney function.