| OH | hydroxycorticosteroid; obstructive hypopnea; occipital horn; occupational health; occupational histo... |
|---|---|
| OHS | obesity hypoventilation syndrome; occipital Horn syndrome; occupational health service; ocular histo... |
| OLIDS | open loop insulin delivery system |
| OMVC | open mitral valve commissurotomy |
| OPA | open procurement agency |