| Abbreviation | Definition |
|---|---|
| OSC | open sigmoid colectomy |
| OSC | Ophthalmic Service Committee |
| OSC | oscillation |
| OSC | osteocalcin |
| OSC | Overview and Scrutiny Committee |
| OSCEXX | Objective Structured Clinical Exam, Observed Structured Clinical Examination |
| OSCHR | Office for Strategic Co-ordination of Health Research |
| OSG | odontostomatognathic |
| OSG | Office of Surgeon General |
| OSG | officer support group |
| OSPE1XX | Objective structured practical examination Part 1 |
| OSPE2XX | Objective structured practical examination Part 2 |
| OSPHE | Objective Structured Public Health Exam |
| OT | occlusion time |
| OT | olfactory threshold |
| OT | omeprazole test |
| OT | open tracheostomy |
| OT | optic tract |
| OT | oral tolerance |
| OT | orthopaedic treatment |