| RHBF | reactive hyperemia blood flow |
|---|---|
| RND | radical neck dissection; radionuclide dacryography; reactive neurotic depression |
| ROI | reactive oxygen intermediate; region of interest; right occipitolateral [fetal position] |
| ROS | reactive oxygen species; review of systems; rod outer segment |
| RP | radial pulse; radiopharmaceutical; rapid processing [of film]; Raynaud phenomenon; reactive protein;... |