| FET | field-effect transistor; forced expiratory time |
|---|---|
| FF | degree of fineness of abrasive particles; fat-free; father factor; fecal frequency; fertility factor... |
| FFE | fast field echo; fecal fat excretion |
| FFF | degree of fineness of abrasive particles; field-flow fractionation; flicker fusion frequency |
| FIGE | field inversion gel electrophoresis |