| RED | radiation experience data; rapid erythrocyte degeneration |
|---|---|
| RHD | radiological health data; relative hepatic dullness; renal hypertensive disease; rheumatic heart dis... |
| SADD | Short-Alcohol Dependence Data [questionnaire]; standardized assessment of depressive disorders; Stud... |
| SCDF | skin condition data form |
| SDILINE | Selective Dissemination of Information On-Line [data bank] |