Lung Volumes Normal tidal volume is 6-8 cc/kg. Normal vital capacity is 60 cc/kg +/- 20% (i.e. 10-fold increase of TV), and is correlated with the ability to cough and take deep breaths. Inspiratory capacity (IC, the maximal volume inspired from FRC) is one of the only tests that can detect extrathoracic airway obstruction. FRC […]