| ETCO2 | end-tidal carbon dioxide [concentration] |
|---|---|
| ETPCO2 | end-tidal partial carbon dioxide [concentration] |
| 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 |