| RGN | Registered General Nurse |
|---|---|
| RMN | Registered Mental Nurse |
| RN | radionuclide; red nucleus; Registered Nurse; registry number; residual nitrogen; reticular nucleus |
| RNA | radionuclide angiography; Registered Nurse Anesthetist; ribonucleic acid; rough, noncapsulated, avir... |
| RN-C | registered nurse-certification |