| RRE, RR&E | round, regular, and equal [pupils] |
|---|---|
| RRR | regular rhythm and rate; renin release rate (or ratio) |
| RR&R | regular rate and rhythm |
| RSA | rabbit serum albumin; regular spiking activity; relative specific activity; relative standard accura... |
| RSR | regular sinus rhythm; relative survival rate; right superior rectus [muscle] |