| FEF50/FIF50 | ratio of expiratory flow to inspiratory flow at 50% of forced vital capacity |
|---|---|
| FEFV | forced expiratory flow volume |
| FES | family environment scale; fat embolism syndrome; flame emission spectroscopy; forced expiratory spir... |
| FET | field-effect transistor; forced expiratory time |
| FETs | forced expiratory time in seconds |
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