The document defines common abbreviations used in the urinary system. ARF refers to acute renal failure, which is sudden kidney failure from various causes like injury or infection. Cath is shorthand for catheterization, which is inserting a tube into the bladder through the urethra, usually to insert dye or extract urine. GU refers to the genitourinary system, which combines the urinary and reproductive systems. ESWL is a non-invasive procedure using ultrasound to break up stones, and RP is a retrograde pyelogram where dye is inserted via catheter to take x-rays of the kidneys, ureters and bladder.

1. Urinary System Common Abbreviations