| RCR | relative consumption rate; replication-competent retrovirus; respiratory control ratio |
|---|---|
| RCU | respiratory care unit |
| RD | radial deviation; radiology department; rate difference; Raynaud disease; reaction of degeneration; ... |
| RDI | recommended daily intake; respiratory disturbance index; rupture-delivery interval |
| RDQ | respiratory disease questionnaire |