🩸 Estimated Blood Volume (EBV)

When to use

Enter weight and select the population (adult male/female, child, infant, neonate); the tool multiplies weight by the coefficient.

How it works

EBV = weight (kg) × coefficient (mL/kg). Common coefficients: adult male 75, adult female 65, child 70, infant 80, neonate 85 (preterm up to 90–100).

Key points

• EBV is the denominator for estimating maximum allowable blood loss, percent blood loss, and transfusion volume, so a population-appropriate coefficient matters more than apparent precision (original synthesis · not guideline verbatim).
• Weight-based coefficients overestimate volume in obese or edematous patients, where lean or ideal body weight gives a closer figure.
• Neonatal and preterm coefficients are the highest, reflecting proportionally larger blood volume per kilogram.

References

• Nadler SB, et al. Prediction of blood volume in normal human adults. Surgery. 1962;51(2):224-232.

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