| RRT | random response technique; Registered Respiratory Therapist; relative retention time |
|---|---|
| RS | radioscaphoid; random sample; rating schedule; Raynaud syndrome; recipient's serum; rectal sinus; re... |
| RSD | reflex sympathetic dystrophy; relative standard deviation |
| RSMR | relative standard mortality rate |
| RSR | regular sinus rhythm; relative survival rate; right superior rectus [muscle] |