| NIF | negative inspiratory force; neutrophil immobilizing factor; nonintestinal fibroblast |
|---|---|
| PI | inspiratory pressure |
| PIF | paratoid isoelectric focusing variant protein; peak inspiratory flow; proinsulin-free; prolactin-inh... |
| PIFR | peak inspiratory flow rate |
| PIP | paralytic infantile paralysis; peak inflation pressure, peak inspiratory pressure; periodic interim ... |