| NPOS | nurses professional orientation scale |
|---|---|
| OI | obturator internus; occasional insomnia; opportunistic infection; opsonic index; orgasmic impairment... |
| OMC | office of managed care; orientation-memory-concentration [test] |
| OMCT | Orientation-Memory-Concentration Test |
| OT | objective test; oblique talus; occlusion time; occupational therapist, occupational therapy; ocular ... |