| OHN | occupational health nurse |
|---|---|
| OPN | ophthalmic nurse; osteopontin |
| PDN | prednisone; private duty nurse |
| PHN | paroxysmal noctural hemoglobinuria; passive Heymann nephritis; postherpetic neuralgia; public health... |
| PNP | pancreatic polypeptide; para-nitrophenol; peak negative pressure; pediatric nurse practitioner; peri... |