| OCG | omnicardiogram; oral cholecystogram |
|---|---|
| OCH | oral contraceptive hormone |
| OCM | oral contraceptive medication |
| OCS | occipital condyle syndrome; Ondine's curse syndrome; open canalicular system; oral contraceptive ste... |
| OCT | object classification test; optimal cutting temperature; oral contraceptive therapy; ornithine carba... |
| OFDS | Oral-Facial-Digital syndromes |
|---|---|
| ROU | Recurrent oral ulcer |
| TOPV | Trivalent oral poliovaccine |
| PO | per oral |