| NPUI | nursing process utilization inventory |
|---|---|
| OI | obturator internus; occasional insomnia; opportunistic infection; opsonic index; orgasmic impairment... |
| OPI | oculoparalytic illusion; Omnibus Personality Inventory |
| PI | first meiotic prophase; isoelectric point; pacing impulse; package insert; pancreatic insufficiency;... |
| PIC | Personality Inventory for Children; polymorphism information content |