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| German | English |
| Forcierte Vitalkapazität | forced vital capacity (The volume of air that can forcibly be blown out after full inspiration, measured in liters) |
| Forcierter inspiratorischer Fluss | forced inspiratory flow (The speed of air coming into the lung under forced inspiration) |
| Forciertes exspiratorisches Volumen | forced expiratory volume (The volume of air coming out of the lung under forced conditions) |