The increase in blood plasma (starts to increase from 10 weeks pregnancy and gradually increases until the end of pregnancy,a maximum 34 weeks; to leave a few drops to 40-48% compared with the volume of plasma nonpregnant women. He is 4 liters,and nonpregnant women - 2.5 l.

The increase in red blood cells (to a lesser extent, from 10 weeks bermennosti and increases until the end of pregnancy) to 25%. When you receive the amount of iron erythrocytes increased to 32%, without taking iron - 12%.

By 26 weeks since the increase in plasma volume exceeds the increase circulating erythrocytesthat develops during pregnancy fzioloigchesskaya anemia of pregnancy. In normal for pregnant characterized reduced hemoglobin. The lower limit of normal for pregnant women 110 g / hemoglobin. Reduces hematocrit to 32-34%.

BCC increases the maximum to 30-32 weeks - up to 48%.Outside of pregnancy BCC -- 6.5% of body weight during pregnancy, 10% of body weight. Greater increase BCC in 1 and 2 trimesters, and then there is a gradual increase in the stabilization of the bcc,