U
unit / uranium / urine
U/A
urinalysis
UCD
usual childhood diseases
ug
microgram
UGI
upper gastrointestinal
UGIS
upper gastrointestinal series
UIQ
upper inner quadrant (breast)
uL
microlitre
ULQ
upper left quadrant
umol
micromol
ung
unguentum (ointment)
UO
under observation
UOQ
upper outer quadrant (breast)
URQ
upper right quadrant
URTI
upper respiratory tract infection
US or U/S
ultrasound
ut dict
ut dictum (as directed)
UTI
urinary tract infection
V
venous / vein / vagina / vision / volt / volume
VA
viral antigen
vax
vaccine
VC
vital capacity
VH
very high
via
by way of