| FEF50 | forced expiratory flow at 50% of forced vital capacity |
|---|---|
| FIF50 | forced inspiratory flow at 50% of forced vital capacity |
| PTD | percutaneous transluminal dilatation; permanent total disability; personality trait disorder; preter... |
| SVD | single vessel disease; singular value decomposition; small vessel disease; spontaneous vaginal deliv... |
| FEF | Forced Expiratory Flow |