| OSA | obstructive sleep apnea; Office of Services to the Aging; Optical Society of America; ovarian sectio... |
|---|---|
| OSRD | Office of Scientific Research and Development |
| OST | object sorting test; Office of Science and Technology |
| OT | objective test; oblique talus; occlusion time; occupational therapist, occupational therapy; ocular ... |
| OTA | occupational therapy assistant; Office of Technology Assessment; ornithine transaminase; orthotoluid... |