| R | Right |
| R/O | Removal Of |
| R/O | Removal Of, Rule Out |
| RA | Right Atrium |
| RA | Rheumatoid Arthritis |
| RBC | Red Blood Cell, Red Blood Count |
| RER | Renal Excretion Rate |
| RF | Rheumatic Fever |
| RHF | Right Sided Heart Failure |
| RIF | Right Iliac Fossa |
| RLQ | Right Lower Quadrant |
| ROM | Range Of Motion |
| RTI | Respiratory Tract Infection |
| RV | Right Ventricle |
| Rx | Prescription, Treatment |
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