flowvolumeloop
Flow-volume loop, also known as a flow-volume curve, is a graphical representation used in spirometry to assess airway function. The plot shows instantaneous airflow as a function of lung volume during a forced expiratory maneuver from total lung capacity to residual volume, followed by a forced inspiratory maneuver back to TLC. The result forms two limbs: expiratory and inspiratory, creating a closed loop that reflects dynamic ventilation.
In healthy individuals, the loop displays a characteristic, smooth shape with a sharp peak expiratory flow
The flow-volume loop is also useful for evaluating specific patterns of central airway obstruction. Variable extrathoracic
Obtaining a reliable loop requires patient cooperation and proper technique during spirometry. Limitations include dependence on