| Abbreviation | Definition |
|---|---|
| OPC | Out-Patient Clinic |
| OPCAB | Off-Pump Coronary Artery Bypass |
| OPD | Once Per Day |
| OPD | Out Patients Department |
| OPG | OrthoPantomoGram |
| OPH | Oromocto Public Hospital |
| OPMAS | Oncology Patient Management Audit System |
| OPPM | Open Prefascial Polypropylene Mesh |
| OPPS | Outpatient Prospective Payment System |
| OPR | Oral Phonogram Review |
| OPSI | Overwhelming Post-Splenectomy Infection |
| OPSN | Outcomes Potentially Sensitive to Nursing |
| OPSOSA | OPeratore SOcio SAnitario |
| OPSQ | Office of Patient Safety and Quality |
| OPSQ | Osteoporosis Patient Satisfaction Questionnaire |
| OR(s) | Operating Room(s) |
| OREP | Occupational Risk Exposure Profile (in South Africa) |
| OREP | Occupational Risk & Exposure Profile |
| OREP | Occupational Risk & Exposure Profile (in South Africa) |
| ORH | Oxford Radcliffe Hospitals |