| FEF50 | forced expiratory flow at 50% of forced vital capacity |
|---|---|
| CT | calcitonin; calf testis; cardiac tamponade; cardiothoracic [ratio]; carotid tracing; carpal tunnel; ... |
| PTT | partial thromboplastin time; particle transport time; posterior tibial tendon (transfer); prothrombi... |
| FET | field-effect transistor; forced expiratory time |
| FETs | forced expiratory time in seconds |