| RTR | Recreational Therapist, Registered; red blood cell turnover rate; retention time ratio |
|---|---|
| RT(R)(ARRT) | Registered Technologist, Radiography certified by the American Registry of Radiologic Technologists)... |
| SRN | State Registered Nurse |
| SRP | short rib-polydactyly [syndrome]; signal recognition particle; Society for Radiological Protection; ... |