| O/A | On Admission |
| O/E | On Examination |
| OA | Osteoarthritis |
| Obs., OBS | Obstetric |
| OD | Oculus Dexter (Right Eye) |
| OGTT | Oral Glucose Tolerance Test |
| OPD | Out Patients Department |
| Ophth. | Ophthalmology |
| ORIF | Open Reduction And Internal Fixation |
| OS | Oculus Sinister (Left Eye) |
| OU | Oculus Uterque (Each Eye) |
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