| RI | Regular Insulin |
|---|---|
| RI | radiation intensity; radioactive isotope; radioimmunology; recession index; recombinant inbred [strain]; refractive index; regenerative index; regional ileitis; regular insulin; relative intensity; release inhibition; remission induction; renal insufficiency; replicative intermediate; resistive index; respiratory illness; respiratory index; retroactive inhibition; retroactive interference; ribosome; rosette index (or inhibition) |
| ri | intraclass correlation coefficient |
| RIA | Radio-Immuno-Assay; 방사 면역법 |
| RIA | radioimmunoassay; reversible ischemic attack |
| RIA-DA | radioimmunoassay double antibody [test] |
| RIAS | Roter Interactional Analysis System |
| Rib | riboflavin; ribose |
| RIBA | Recombinant Immuno-Blot Assay |
| RIBA | recombinant immunoblot assay |