| MRR | marrow release rate; maximum relation rate |
|---|---|
| PCR | patient contact record; phosphocreatinine; plasma clearance rate; polymerase chain reaction; post-co... |
| PFR | parotid flow rate; peak flow rate |
| PRR | proton relaxation rate; pulse repetition rate |
| RRR | regular rhythm and rate; renin release rate (or ratio) |