| Abbreviation | Definition |
|---|---|
| RHA | right hepatic artery |
| RHA | The RHAs were abolished–along with Family Health Services Authorities and the District Health Authorities–in 1995, and their duties taken over by the Health Authority, a body which in turn was buried |
| RHB | reduced haemoglobin |
| RHB | regional health board (obsolete) |
| RHB | right heart bypass |
| RICS | radioimmunoconjugates |
| RICS | rehabilitation and intermediate care service |
| RID | radial immunodiffusion |
| RID | radioimmunodetection |
| RID | Regional Implementation Directors |
| RID | remission-inducing drug |
| RID | restless, irritable and discontented |
| RIDDOR | Reporting of Injuries, Diseases and Dangerous Occurrences (at work) Regulations |
| RIG | rabies immunoglobulin |
| RIG | reimbursement grant |
| RIMA | reversible inhibitor of monoamine oxidase type A |
| RIND | Reversible ischaemic neurologic deficit |
| RIPA | Regulation of Investigatory Powers Act 2000 |
| RIPA | Royal Institute of Public Administration |
| RIPH | Royal Institute of Public Health(it merged with the Royal Society of Health in 2008 to become the Royal Society for Public Health) |