| pRF | polyclonal rheumatoid factor |
|---|---|
| RA | radioactive; ragocyte; ragweed antigen; rapidly adapting [receptors]; reactive arthritis; reciprocal... |
| RADAI | rheumatoid arthritis disease activity index |
| RAF | repetitive atrial firing; rheumatoid arthritis factor |
| Ragg | rheumatoid agglutinin |