| OHDS | Office of Human Development Services |
|---|---|
| OMFAQ | older Americans resources and services (OARS) multidimensional functional assessment questionnaire |
| OSA | obstructive sleep apnea; Office of Services to the Aging; Optical Society of America; ovarian sectio... |
| OTPS | other than personal services |
| PACS | patient care and services; picture archiving and communication system |