| FEV | familial exudative vitreoretinopathy; forced expiratory volume |
|---|---|
| FEV1, | FEV1 forced expiratory volume in one second |
| FI | fasciculus intrafascicularis; fever caused by infection; fibrinogen; fixed interval; flame ionizatio... |
| FIF | feedback inhibition factor; fibroblast interferon; forced inspiratory flow; formaldehyde-induced flu... |
| FIO2 | forced inspiratory oxygen; fractional concentration of oxygen in inspired gas |