R/O
Rule out
RA
Rheumatoid arthritis
RBC
Red blood cell
RDS
Respiratory distress syndrome
Re
Regarding
REM
Rapid eye movement
reps
Repetitions
RGO
Reciprocating gait orthosis
RHD
Right hand dominant
RLE
Right lower extremity
RLL
Right lower lobe
RLQ
Right lower quadrant
RML
Right middle lobe
RN
Registered nurse
ROM
Range of motion
ROP
Retinopathy of prematurity
ROS
Review of systems
RPE
Rate of perceived exertion
RR
Respiratory rate
R/S
Reschedule
RSV
Respiratory syncytial virus
RT
Respiratory therapist, respiratory therapy
RTC
Return to clinic
RTW
Return to work