[Lung function during normal pregnancy]

Pregnancy is associated with major changes in hormonal status, anatomy and physiology involving all systems of a human organism. This narrative review focuses on the most recent data concerning lung function changes during healthy pregnancy. The major findings are as follows: pregnancy is associated with a reduction in static lung volumes reaching 20% of residual functional capacity; it is also associated with chronic alveolar hyperventilation; lastly, it is not associated with significant changes in variables measured by spirometry such as vital capacity, forced expiratory volume in one second and peak expiratory flow, or airway resistance.