| OORR | orbicularis oculi reflex response |
|---|---|
| PGR | progesterone receptor; psychogalvanic response |
| PGSR | phosphogalvanic skin response |
| POR | patient-oriented research; physician of record; postocclusive oscillatory response; prevalence odds ... |
| PRC | packed red cells; peer review committee; phase response curve; plasma renin concentration; professio... |