| RRI | recurrent respiratory infection; reflex relaxation index; relative response index |
|---|---|
| RSD | reflex sympathetic dystrophy; relative standard deviation |
| RSDS | reflex sympathetic dystrophy syndrome |
| SGR | Sachs-Georgi reaction; Shwartzman generalized reaction; skin galvanic reflex; submandibular gland re... |
| SLR | Shwartzman local reaction; single lens reflex; straight leg raising |