Pediatric Blood Volume Calculator
Calculate total blood volume in children and safe blood draw limits for medical procedures
Calculate Pediatric Blood Volume
Child's current body weight
Select appropriate age category for blood volume calculation
Blood Volume Results
Calculation: 0.0 kg × 75 mL/kg = 0.0 mL
Age Group: Children (>3 months)
Volume in Liters: 0.000 L
Volume in Fluid Ounces: 0.0 fl oz
Percentage of Body Weight: NaN%
Safety Assessment
Example Calculations
7-Month-Old Infant
Age: 7 months old
Weight: 16 lbs (7.26 kg)
Age Group: Children >3 months
Blood Volume Factor: 75 mL/kg
Calculation: 7.26 kg × 75 mL/kg = 544.5 mL
13-Year-Old Adolescent
Age: 13 years old
Weight: 45 kg (100 lbs)
Age Group: Adolescent
Male Factor: 70 mL/kg = 3150 mL
Female Factor: 65 mL/kg = 2925 mL
Blood Volume Factors
Premature Infants
100 mL/kg
Born before 37 weeks
Young Infants
85 mL/kg
Less than 3 months old
Children
75 mL/kg
Over 3 months old
Male Adolescents
70 mL/kg
12+ years old
Female Adolescents
65 mL/kg
12+ years old
Blood Draw Safety
Maximum 2.5% of total blood volume per single draw
Maximum 5% of total blood volume in 24 hours
Use micro-sampling techniques when possible
Monitor for signs of blood loss in small children
Understanding Pediatric Blood Volume
Why is Pediatric Blood Volume Important?
Pediatric blood volume calculations are critical for safe medical procedures, blood collection, transfusion therapy, and hemodynamic monitoring in children. The blood volume per kilogram varies significantly with age, making accurate calculations essential.
Clinical Applications
- •Determining safe blood draw volumes for laboratory tests
- •Calculating blood transfusion requirements
- •Monitoring hemodynamic status during procedures
- •Planning surgical interventions
Age-Based Variations
Total Blood Volume = Weight × Age Factor
- Premature infants: Higher blood volume (100 mL/kg)
- Young infants: Moderate reduction (85 mL/kg)
- Children: Further reduction (75 mL/kg)
- Adolescents: Gender differences emerge (70/65 mL/kg)
Medical Disclaimer: This calculator is for educational purposes only. Always consult healthcare professionals for medical decisions involving pediatric patients.
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Important Medical Disclaimer
This calculator is provided for educational and informational purposes only. It should not be used as a substitute for professional medical advice, diagnosis, or treatment. Pediatric blood volume calculations involve critical medical decisions that must always be made by qualified healthcare professionals. Blood collection and transfusion procedures in children require specialized medical expertise and should only be performed in appropriate clinical settings with proper monitoring and safety protocols.