O2
oxygen
O2 Sat
oxygen saturation
OA
osteoarthritis
OBS
organic brain syndrome
OD
overdose, right eye
OG
orogastric
OOB
out of bed
OR
operating room
ORIF
open reduction internal fixation
OS
left eye
OT
occupational therapy
OU
both eyes
q.
every
q.i.d.
four times per day
(R)
right
RBC
red blood cell count
reg
regular
RLL
right lower lobe
RLQ
right lower quadrant
RN
registeren nurse
R/O
rule out
ROM
Range of motion
ROS
Review of systems
RR
respiration rate