| RAS | rapid atrial stimulation; recurrent aphthous stomatitis; reflex activating stimulus; reliability, av... |
|---|---|
| RASS | rheumatoid arthritis and Sjogren syndrome |
| RAT | repeat action tablet; rheumatoid arthritis test |
| RD | radial deviation; radiology department; rate difference; Raynaud disease; reaction of degeneration; ... |
| RF | radial fiber; radio frequency; receptive field; regurgitant fraction; Reitland-Franklin [unit]; rela... |