| 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 |
| RAT | repeat action tablet; rheumatoid arthritis test |