| RF | radial fiber; radio frequency; receptive field; regurgitant fraction; Reitland-Franklin [unit]; rela... |
|---|---|
| Rf | respiratory frequency; rutherfordium |
| RFT | respiratory function test; rod-and-frame test; right frontotransverse [fetal position] |
| RICU | respiratory intensive care unit |
| RIP | radioimmunoprecipitation; reflex inhibiting pattern; respiratory inductance plethysmography |