What EBV factor for children?

Often ~75–80 mL/kg; this tool uses 75 for child and 80 for infant.

Allowable Blood Loss & EBV

Surgery & Trauma Pediatrics Critical Care Emergency Medicine

Medical context

Estimate blood volume by age group and calculate allowable blood loss before a target hematocrit.

Surgical and trauma teams use this for operative planning, resuscitation, and perioperative risk framing.

This page explains the ABL / EBV formula, how to interpret the output, known limitations, and peer-reviewed references so you can verify results against primary sources and local protocols.

It is grouped under Surgery & Trauma because burn resuscitation, surgical risk, and fluids.

How to use this calculator

Enter the values requested by the ABL / EBV calculator using the units shown beside each field.
Review the calculated result and read the interpretation section before acting on the output.
Check limitations and references if the result will change management, dosing, or disposition.
Use the related calculators section when you need supporting values (for example electrolytes, weight, or complementary risk scores).

Calculator

Age group (EBV mL/kg)Weight (kg)Starting hematocrit (%)Minimum acceptable hematocrit (%)

Result

458 mL

EBV 1500 mL

ABL ≈ EBV × (Hct_start − Hct_min) / Hct_start. Estimate only — guide transfusion decisions clinically.

Educational use only. Confirm results with clinical judgment, primary sources, and local protocols. Not a substitute for professional medical advice. Full disclaimer.

Formula

EBV = weight × age-group factor. ABL = EBV × (Hct_start − Hct_min) / Hct_start.

Interpretation

Supports intraoperative and trauma transfusion planning as a starting estimate.

Limitations

Factors vary by source; clinical bleeding and oxygen delivery dominate decisions.

Frequently asked questions

What EBV factor for children?: Often ~75–80 mL/kg; this tool uses 75 for child and 80 for infant.
Is the ABL / EBV result enough to make a treatment decision?: No. Calculators support medical decision-making but do not replace examination, shared decision-making, institutional protocols, or consultant input when stakes are high.
Does Calcmedical store the values I type in?: Inputs are processed in your browser for this session. We do not ask for patient names or medical record numbers. See our privacy policy for hosting and analytics details.

References

Classic EBV/ABL perioperative estimates