Lung volumes

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There are several different measures of lung volumes, some of which can be taken by Spirometry. They are;

1. Tidal Volume
The volume of air inspired and expired over the course of a normal breath. This is around 500 mls

2. Inspiratory Reserve Volume
The volume of air that can be inspired over and above that of a normal (tidal volume) breath. This is around 3100 mls

3. Expiratory Reserve Volume
The Volume of air that can be expired over and above that of a normal breath. This is around 1200 mls

4. Residual volume
The volume of air that is left in the lungs after maximal expiration; that is after the expiratory reserve volume. It is around 1200 mls but cannot be measured by spirometry.

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