| FEFV | forced expiratory flow volume |
|---|---|
| FES | family environment scale; fat embolism syndrome; flame emission spectroscopy; forced expiratory spir... |
| FEV | familial exudative vitreoretinopathy; forced expiratory volume |
| FEV1, | FEV1 forced expiratory volume in one second |
| HFO-A | high-frequency oscillatory [ventilation]-active [expiratory phase] |