RA rheumatoid arthritis
RAD reactive airway disease
RAI radioactive iodine
RAIU radioactive iodine uptake
RCA right coronary artery
RDW red cell distribution width
REEDA redness, edema, ecchymosis, drainage, approximation
RHD rheumatic heart disease, relative hepatic dullness
RIJ right internal jugular
RLQ right lower quadrant
RM respiratory movement
ROM range of motion
ROS review of systems
RSC right subclavian
RUQ right upper quadrant
RX prescription, pharmacy