| OHN | occupational health nurse |
|---|---|
| OHP | hydroxyprogesterone; hydroxyproline; occupational health plan; Oregon Health Plan; oxygen under high... |
| OHR | occupational health research; Office of Health Research |
| OHS | obesity hypoventilation syndrome; occipital Horn syndrome; occupational health service; ocular histo... |
| OILD | occupational immunologic lung disease |