Which abbreviation is used to refer to the genitourinary system?

The abbreviation used to refer to the genitourinary system is "GU." This acronym is derived from the first letters of the words "genito" (referring to the reproductive organs) and "urinary" (relating to the urinary tract). The genitourinary system encompasses the organs involved in both the reproductive and urinary functions of the body, including the kidneys, bladder, urethra, and the reproductive organs.

Other options do not relate to the genitourinary system specifically. "GI" stands for the gastrointestinal system, which involves the organs responsible for digestion. "HEENT" refers to Head, Eyes, Ears, Nose, and Throat, encompassing aspects of the head and neck region but not related to the urinary or reproductive functions. Lastly, "Fx" typically denotes "fracture" in a medical context, which pertains to bones rather than any aspect of the genitourinary system.