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Table 2 Normal Physiological Respiratory Changes During Pregnancy

From: Asthma and Allergic Diseases in Pregnancy: A Review

Increased Decreased
Tidal volume Functional residual capacity
Minute ventilation Residual volume
Alveolar-arterial O2 gradient Diffusion capacity
Oxygen partial pressure PaCO2
pH, normal or slightly elevated (respiratory alkalosis)  
Respiratory rate unchanged  
  1. Adapted from Weinberger et al [17].