| QF | quality factor; query fever; quick freeze; relative biological effectiveness |
|---|---|
| RF | radial fiber; radio frequency; receptive field; regurgitant fraction; Reitland-Franklin [unit]; rela... |
| Rh | F rheumatic fever |
| RMSF | Rocky Mountain spotted fever |
| RVF | renal vascular failure; Rift Valley fever; right ventricular failure; right visual field |