| RBD | recurrent brief depression; relative biological dose; right border of dullness |
|---|---|
| RLSB | right lower scapular border |
| RSB | reticulocyte standard buffer; right sternal border |
| RUSB | right upper sternal border |
| SB | Bachelor of Science; Schwartz-Bartter [syndrome]; serum bilirubin; shortness of breath; sick bay; si... |