Posted by **Ash** on Wednesday, January 2, 2013 at 4:20pm.

In a lab on lung capacity where lung volumes (Tidal Volume, Expiratory Reserve Volume, Inspiratory Capacity, Inspiratory Reserve Volume, and Vital Capacity) are measured...

Why can't you measure the Inspiratory Reserve Volume (IRV) directly? (In the procedure it says to do IRV = IC - TV, rather than breathing a certain way into the spirometer)

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