| MBF | medullary blood flow; muscle blood flow; myocardial blood flow |
|---|---|
| PBF | peripheral blod flow; placental blood flow; pulmonary blood flow |
| FIF | feedback inhibition factor; fibroblast interferon; forced inspiratory flow; formaldehyde-induced flu... |
| FIF50 | forced inspiratory flow at 50% of forced vital capacity |
| IFR | infrared; inspiratory flow rate |