| OCA | Oculo-Cutaneous Albinism |
|---|---|
| OCA | oculocutaneous albinism; olivopontocerebellar atrophy; oral contraceptive agent |
| OCa | ovarian carcinoma |
| OCAA | Ovarian Cystadenocarcinoma Associated Antigen; Serous Mucinous Ovarian Tumor에만 나타남 |
| OCAD | occlusive carotid artery disease |