| REF | ejection fraction at rest; referred; refused; renal erythropoietic factor |
|---|---|
| REP | replication protein; rest-exercise program; retrograde pyelogram; roentgen equivalent-physical |
| REST | Raynaud's phenomenon, esophageal motor dysfunction, sclerodactyly, and telangiectasia [syndrome]; re... |
| RICE | rest, ice, compression, and elevation |
| ROW | Rendu-Osler-Weber [syndrome]; rest of the world |