| OMT | object modeling technique; ocular microtremor; O-methyltransferase; ophthalmic medical technician or... |
|---|---|
| ORT | object relations technique; operating room technician; oral rehydration therapy |
| RESTT | respiratory therapy technician |
| RT | radiologic technologist; radiotelemetry; radiotherapy; radium therapy; rapid tranquilization; reacti... |
| VRT | vehicle rescue technician; volume-rendering technique |