| 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... |
| OV | oculovestibular; office visit; osteoid volume; outflow volume; ovalbumin; ovary; overventilation; ov... |
| OWI | Office of Worksite Initiatives |