| RPC | reactive perforating collagenosis; relapsing polychondritis; relative proliferative capacity |
|---|---|
| RPI | regional perfusion index; relative percentage index; reticulocyte production index, ribose 5-phospha... |
| RRI | recurrent respiratory infection; reflex relaxation index; relative response index |
| RRP | relative refractory period |
| RRT | random response technique; Registered Respiratory Therapist; relative retention time |