| Abbreviation | Definition |
|---|---|
| RCM | Right Costal Margin |
| RCPE | Royal College of Physicians of Edinburgh |
| RCPI | Royal College of Physicians of Ireland |
| RCPT | Royal College of Physicians of Thailand |
| RCT | Rectum Cracking Time |
| RCTMS | Repetitive Cranial Trans-Magnetic Stimulation |
| RCX | Ramus Circumflexus (circumflex artery) |
| RD | Recently Disgorged |
| RD | Respiratory Disease |
| RD | Right Deltoid |
| RD50 | concentration producing a 50% decrease in respiratory rate following a 10-minute exposure |
| RDA | Recommended Daily Allowance |
| RDA | Recommended Dietary Allowance |
| RDF | Radial Distribution Function |
| RDI | Recommended Daily Intake |
| RDI | Required Daily Input |
| RDLD | Receptive Developmental Language Disorder |
| RDQ | Remission from Depression Questionnaire |
| RDS | Respiratory Distress Syndrome |
| RDS | Respiratroy Distress Syndrome |