| Abbreviation | Definition |
|---|---|
| RM | respiratory movement |
| RM | respiratory muscle |
| RM | resting metabolism |
| RM | rhabdomyolysis |
| RM | Royal Marsden |
| RM | ruptured membrane |
| RMI | recent myocardial infarction |
| RMI | reperfused myocardial infarction |
| RMI | Resource Management Initiative |
| RMI | Risk of Malignancy Index |
| RMO | Regional Medical Officer |
| RMO | Responsible Medical Officer |
| RMSG | Risk Management Steering Group |
| RMT | Registered Music Therapist |
| RN | radical nephrectomy |
| RN | radionuclide |
| RN | ranitidine |
| RN | rebound nystagmus |
| RN | red nucleus |
| RN | reflux nephropathy |