| OSA | obstructive sleep apnea; Office of Services to the Aging; Optical Society of America; ovarian sectio... |
|---|---|
| OSAS | obstructive sleep apnea syndrome |
| PMS | patient management system; perimenstrual syndrome; periodic movements during sleep; phenazine methos... |
| PSA | parasternal short axis; pleomorphic salivary gland adenoma; polyethylene sulfonic acid; polysacchari... |
| qhs | every hour of sleep [Lat. quaque hora somni] |