| Abbreviation | Definition |
|---|---|
| RAS | respiratory assessment service |
| RAS | retinoic acid syndrome |
| RAS | Rokitansky-Aschoff sinus |
| RAS | rotational atherectomy system |
| RASP | resource allocation and service planning |
| RAT | radiation therapy |
| RAT | recombinant human antithrombin |
| RAT | Remuneration And Terms (of service committee) |
| RAT | rheumatoid arthritis test |
| RAT | right atrial tachycardia |
| RAWP | Resource Allocation Working Party |
| RBAC | role-based access control |
| RCA | radiofrequency catheter ablation |
| RCA | random case analysis |
| RCA | red cell agglutination |
| RCA | red cell aggregate |
| RCA | renal carcinoma |
| RCA | renal cell adenoma |
| RCA | renal concentrating ability |
| RCA | replication-competent adenovirus |