| FECO2 | fractional concentration of carbon dioxide in expired gas |
|---|---|
| FEO2, | FEO2 fractional concentration of oxygen in expired gas |
| FIC | Fogarty International Center; fractional inhibitory concentration |
| FiCO2, | FICO2 fractional concentration of carbon dioxide in inspired gas |
| FIO2 | forced inspiratory oxygen; fractional concentration of oxygen in inspired gas |