| RADAI | rheumatoid arthritis disease activity index |
|---|---|
| RAF | repetitive atrial firing; rheumatoid arthritis factor |
| RANA | rheumatoid arthritis nuclear antigen |
| RAS | rapid atrial stimulation; recurrent aphthous stomatitis; reflex activating stimulus; reliability, av... |
| RASS | rheumatoid arthritis and Sjogren syndrome |