| Abbreviation | Definition |
|---|---|
| RER | Respiratory Exchange Ratio |
| RERI | relative excess risk due to interaction |
| REST | Repressor Element Silencing Transcription factor |
| RET | Retention |
| RET | Retired |
| RET | Returned |
| REV | Reticuloendotheliosis virus |
| RF | Renal failure |
| RF | Response Factor |
| RF | Right Foot |
| RFM | Respirable Fibers Management |
| RFO | Right Foot Off |
| RFPSG | Royal Faculty of Physicians and Surgeons of Glasgow |
| RFV | Right Ventricular Failure |
| RGFB | Radial Gutter Fracture Brace |
| RGO | Reflux Gastro- Oesophagien |
| RGP | RetroGrade Pyelography |
| RGS | Regulator of G Protein Signaling |
| RH | Right Hand |
| RHA | RHeumatoid Arthritis |