| PVR | peripheral vascular resistance; perspective volume rendering; poliovirus receptor; postvoiding resid... |
|---|---|
| RA | radioactive; ragocyte; ragweed antigen; rapidly adapting [receptors]; reactive arthritis; reciprocal... |
| RLC | residual lung capacity |
| RLO | residual lymphatic output |
| RN | radionuclide; red nucleus; Registered Nurse; registry number; residual nitrogen; reticular nucleus |