Definition
- Blood volume is the total volume of blood (cells plus plasma) in the circulatory system; blood is a liquid connective tissue filling the heart and blood vessels.
Adult blood volume5 to 6 liters, about 8% of body weight
Normal Blood Volume
Normal blood volume
Group
Adult male
- Blood volume
- 5 to 6 liters
Adult female
- Blood volume
- 4.5 to 5.5 liters
Adult, per kg body weight
- Blood volume
- 70 to 80 ml/kg
Children, per kg body weight
- Blood volume
- 80 to 90 ml/kg
Per body surface area
- Blood volume
- 2.8 liters/m2
- Children have a lower absolute blood volume than adults, but a higher volume per kg body weight, since the value is expressed relative to their smaller body mass.