The effects of pregnancy on maternal blood volume and red cell mass during pregnancy are:

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During pregnancy, the maternal blood volume increases by approximately 30-50% to accommodate the needs of the developing fetus and support placental circulation. This increase in blood volume is necessary to provide nutrients and oxygen to the growing fetus. At the same time, the red cell mass also increases, although not as much as the blood volume, by about 20-30%, to maintain the oxygen-carrying capacity of the blood. Therefore, both maternal blood volume and red cell mass increase during pregnancy.

The Effects of Pregnancy on Maternal Blood Volume and Red