| R.D. | registered dietitian |
|---|---|
| R.E.A.L. | Revised European American Classification of Lymphoid Neoplasms |
| R.E.G. | rheoencephalography |
| R.F | Rheumatic Fever |
| R.F.S. | Relapse Free Survival |
| R.H.D. | Rheumatic Heart Disease |
| R.I. | Resistivity Index |
| R.I.A. | radio-immunological assay |
| R.L.N. | regional lymph node |
| R.P. | relative potency |