| POS | periosteal osteosarcoma; physician order set; point of service; polycystic ovary syndrome; psychoorganic syndrome |
|---|---|
| pos | position; positive |
| POSC | problem-oriented system of charting |
| POSM | patient-operated selector mechanism |
| POSS | proximal over-shoulder strap |
| POSSUM | Pictures of Standard Syndromes and Undiagnosed Malformations |
| post | posterior |
| Post | Pit posterior pituitary [gland] |
| postgangl | postganglionic |
| postop, post-op | postoperative |