Pediatric Blood Volume Calculator

How to Use the Calculator

• Enter the Required Measurements:
  • Sex(Male/Female)
  • Age(Premature neonate, infant, child, or adolescent)
  • Weight(in kg)
• Receive Results:
  • The calculator will estimate calorie to maintain weight based on the provided parameters.

Why is Pediatric Blood Volume Useful?

Pediatric blood volume plays a crucial role in hospital care, particularly in:

• Hemodynamic and Pharmacologic Interventions: Accurate blood volume estimates ensure appropriate fluid and medication management.
• Transfusion Practices: Helps determine the exact amount of blood required for transfusions to avoid complications.
• Blood Collection for Tests:
  • In adults, collecting 20 mL of blood has negligible effects.
  • In newborns, the same amount is approximately 8% of their total blood volume, potentially leading to serious complications.
• Guidelines for Safe Blood Collection:
  • Maximum allowable blood draw in 24 hours: 1–5% of total blood volume.

How is Blood Volume Estimated in Pediatrics?

The Pediatric Blood Volume Calculator uses the formula:
TBV = Weight × Age Factor

Age Factors:

• Premature infants: 100 mL/kg
• Infants (3 months): 85 mL/kg
• Children (>3 months): 75 mL/kg
• Male adolescents: 70 mL/kg
• Female adolescents: 65 mL/kg

What is the Blood Volume in Newborns?

• Premature Neonates: 89–105 mL/kg
• Full-term Neonates: 82–86 mL/kg

What is the Blood Volume in Infants and Older Children?

• Infants (up to 3 months): 82–86 mL/kg
• Children (>3 months): 73–82 mL/kg
• Adolescents:
  • Males: 70 mL/kg
  • Females: 65 mL/kg

Key Insight:

As children grow, their blood volume per kilogram decreases, approaching adult levels during puberty.

Why is This Important?

Understanding pediatric blood volume is critical for ensuring:

• Safe transfusions and blood draws.
• Accurate medical dosing.
• Effective management of critical conditions like dehydration or blood loss.