| RIBA | recombinant immunoblot assay |
|---|---|
| RIPA | radioimmunoprecipitation assay |
| RISA | radioactive iodinated serum albumin; radioimmunosorbent assay |
| RMA | rapid membrane assay; refuses medical advice; Registered Medical Assistant; relative medullary area;... |
| RRA | radioreceptor assay; registered record administrator |