U

U – unit

UA – urinalysis

UAP – unlicensed assistive personnel

UC – urine culture

UDS – urine drug screen

UE – upper extremity

UGIB – upper gastrointestinal bleed

Unc – uncollected

Unk – unknown

Unv – unverified

UO – urine output

UOP – urinary output

UR – utilization review

URI – upper respiratory infection

URR – urea reduction ratio

US – ultrasound

USG – ultrasonography

UTD – up to date

UTI – urinary tract infection