| OHSS | ovarian hyperstimulation syndrome |
|---|---|
| OPSA | ovarian papillary serous adenocarcinoma |
| OSA | obstructive sleep apnea; Office of Services to the Aging; Optical Society of America; ovarian sectio... |
| OTR | Ovarian Tumor Registry; Occupational Therapist, Registered |
| OVC | ovarian cancer |