Pediatric Blood Volume Calculator
Our pediatric blood volume calculator uses body weight to find the total blood volume of children. The estimated blood volume in pediatrics depends on the age of the child. As such, there are separate formulas for blood volume in newborn babies, infants under three months of age, children over three months, and adolescents.
Interested? Keep reading to learn:
- Why pediatric blood volume is useful;
- How pediatric blood volume is estimated; and
- The blood volume in infants.
Please note that we designed this pediatric blood volume calculator for children only. There is a separate calculator that estimates the blood volume in adults and one that finds the volume of blood plasma.
We try our best to make our Omni Calculators as precise and reliable as possible. However, this tool can never replace professional medical advice.
Why is pediatric blood volume useful?
Similar to the adult total blood volume, these values are vital in hospital perfusion care. This includes hemodynamic and pharmacologic interventions and transfusion practices.
Additionally, these values are critical in the process of blood collection for tests. For an adult patient, collecting 20 ml of blood won't have a noticeable impact on the organism, whereas the same amount of blood is about 8% of a newborn baby's total blood volume. According to the, the maximum volume of blood that can be drawn safely from an infant in 24 hours ranges from 1% to 5% of his total blood volume.
How is the blood volume estimated in pediatrics?
Our pediatric blood volume calculator uses the formula:
TBV = weight * age factor
age factor equals:
- 100 mL/kg for premature infants;
- 85 mL/kg for babies younger than 3 months;
- 75 mL/kg for children over the age of 3 months;
- 70 mL/kg for male adolescents;
- 65 mL/kg for female adolescents.
What's the blood volume in a newborn baby?
The volume of blood in a premature neonate ranges from
89 to 105 mL per kilogram of body weight, while a full-term baby has from
82 to 86 mL/kg of blood.
What's the blood volume in infants and older children?
The blood volume in infants and older children is markedly different.
- The blood volume in infants up to three months of age is
- It is assumed that children have around
73-82 mL/kgof blood after the third month.
- The volume of blood per kilogram of body weight decreases with age and in puberty reaches about the same values as in adults, which is
70 mL/kgfor males and
65 mL/kgfor females.