| OCT | object classification test; optimal cutting temperature; oral contraceptive therapy; ornithine carba... |
|---|---|
| OMT | object modeling technique; ocular microtremor; O-methyltransferase; ophthalmic medical technician or... |
| ORT | object relations technique; operating room technician; oral rehydration therapy |
| OTA | occupational therapy assistant; Office of Technology Assessment; ornithine transaminase; orthotoluid... |
| PBT | Paul-Bunnell test; phenacetin breath test; piebald trait; profile-based therapy |