Around which weeks does blood volume reach its peak?

Around which weeks does blood volume reach its peak?

• A. 32 to 34 weeks
• B. 20 to 22 weeks
• C. 40 to 42 weeks
• D. 8 to 10 weeks

Answer: (A)

Maternal blood volume expands substantially during pregnancy to support placental and fetal needs, with plasma volume increasing more than red cell mass, which also leads to a mild physiologic anemia of pregnancy. This expansion reaches its maximum in late pregnancy, around the end of the second trimester to the early third trimester, typically about 32 to 34 weeks gestation. After this peak, the rise levels off and the elevated volume persists toward term, then gradually returns toward pre-pregnant levels postpartum. Therefore, the most accurate time frame for the peak is around 32 to 34 weeks.

Maternal blood volume expands substantially during pregnancy to support placental and fetal needs, with plasma volume increasing more than red cell mass, which also leads to a mild physiologic anemia of pregnancy. This expansion reaches its maximum in late pregnancy, around the end of the second trimester to the early third trimester, typically about 32 to 34 weeks gestation. After this peak, the rise levels off and the elevated volume persists toward term, then gradually returns toward pre-pregnant levels postpartum. Therefore, the most accurate time frame for the peak is around 32 to 34 weeks.