| HSR | Harleco synthetic resin; heated serum reagin; homogeneously staining region |
|---|---|
| RHC | resin hemoperfusion column; respiration has ceased; right heart catheterization; right hypochondrium... |
| RT3U | resin triiodothyronine uptake |
| RU | radioulnar; rat unit; reading unit; residual urine; resin uptake; resistance unit; retrograde urogra... |
| RUR | resin-uptake ratio |