| 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 |
| PImax | maximum inspiratory pressure at residual volume |