During pregnancy, the decrease in functional residual capacity ranges from?

During pregnancy, the decrease in functional residual capacity (FRC) is primarily attributed to the upward displacement of the diaphragm from the enlarging uterus, which reduces the volume of air that remains in the lungs after expiration. The typical decrease in FRC ranges from about 20% to 30% of the normal value. This reduction is significant as it can influence the respiratory physiology of the pregnant person, potentially leading to a shallow breathing pattern and a reduced capacity to buffer metabolic acidosis.

Recognizing this decrease is crucial for healthcare providers, especially in critical care settings, as it may impact the management of patients at various stages of pregnancy. Monitoring lung function and the overall respiratory status is essential for maintaining adequate oxygenation for both the individual and the developing fetus. Understanding this range also helps in assessing the implications for anesthesia and respiratory support during labor and delivery.