During pregnancy, a significant increase in maternal blood volume occurs to meet the demands of the growing fetus and placenta, as well as to prepare for blood loss during delivery.
This physiological adaptation is crucial for maintaining adequate circulation and oxygen delivery. Studies show that by the third trimester, specifically around the 30-34 weeks of gestation mark, the total blood volume can expand substantially.
The expected increase in blood volume during this period is typically between 40% to 50% above the non-pregnant baseline.
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