| RA | Rheumatoid Arthritis | - | Medical(slang) |
| RA | Rheumatoid Arthritis | - | Medical(slang) |
| RAD | Reactive Airway Disease | - | Medical(slang) |
| RAI | Radioactive Iodine | - | Medical(slang) |
| RAIU | Radioactive Iodine Uptake | - | Medical(slang) |
| RCA | Right Coronary Artery | - | Medical(slang) |
| RDW | Red Cell Distribution Width | - | Medical(slang) |
| REEDA | Redness | - | Medical(slang) |
| RHD | Rheumatic Heart Disease | - | Medical(slang) |
| RIJ | Right Internal Jugular | - | Medical(slang) |
| RLQ | Right Lower Quadrant | - | Medical(slang) |
| RM | Respiratory Movement | - | Medical(slang) |
| RM | Respiratory Movement | - | Medical(slang) |
| ROM | Range Of Motion | - | Medical(slang) |
| ROS | Review Of Systems | - | Medical(slang) |
| RSC | Right Subclavian | - | Medical(slang) |
| RSR | Regular Sinus Rhythym | - | Medical(slang) |
| RSV | Respiratory Syncitial Virus | - | Medical(slang) |
| RUQ | Right Upper Quadrant | - | Medical(slang) |
| RX | Prescription | - | Medical(slang) |
