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How much blood does a pregnant woman have in her system?

2 doctors weighed in
Dr. Miguel Cano
Obstetrics & Gynecology
1 doctor agrees

In brief: 6-8 liters

Blood volume increases progressively from 6-8 weeks gestation and reaches a maximum at approximately 32-34 weeks with little change thereafter. The increase in plasma volume (40-50%) is relatively greater than that of red cell mass (20-30%) resulting in hemodilution and a decrease in haemoglobin concentration.
Approximately 300-500 cc is lost with vag delivery & up to 1000 cc for c-sections.

In brief: 6-8 liters

Blood volume increases progressively from 6-8 weeks gestation and reaches a maximum at approximately 32-34 weeks with little change thereafter. The increase in plasma volume (40-50%) is relatively greater than that of red cell mass (20-30%) resulting in hemodilution and a decrease in haemoglobin concentration.
Approximately 300-500 cc is lost with vag delivery & up to 1000 cc for c-sections.
Dr. Miguel Cano
Dr. Miguel Cano
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