Maternal blood volume increases by 45% during pregnancy.
Blood volume increases truly within the first few weeks of gestation and increases continuously throughout the pregnancy. The total blood volume increase varies from 20% to 100% above prepregnancy levels, usually close to 45%.
Pregnant women have increased blood volume to give extra blood flow to the uterus and other organs, importantly the kidneys. The greater volume brings more blood to the vessels and increases oil gland secretion. The distinct changes are biologically conceivable red cell mass rises respectively in need to carry the extra oxygen taken up in pregnancy. larger plasma volume increment is needed to cope with the very large increases in blood flow to organs.
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