| OMT | object modeling technique; ocular microtremor; O-methyltransferase; ophthalmic medical technician or... |
|---|---|
| ORT | object relations technique; operating room technician; oral rehydration therapy |
| pAg | protein A-gold [technique] |
| PERT | program evaluation review technique |
| RO | radiation oncology; radiation output; ratio of; relative odds; renal osteodystrophy; reverse osmosis... |