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Estimated Blood Loss (Gross Formula)

Hmotnosť

Pre-op Hematocrit (%)

Post-op Hematocrit (%)

What is Estimated Blood Loss?

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Estimated blood loss (EBL) during surgery uses pre- and post-operative haematocrit values with the Gross formula to quantify blood lost.

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Vzorec

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f(x)

Estimated blood loss (mL) = Hemoglobin change (g/dL) × Weight (kg) × Estimated blood volume (70 mL/kg) / Pre-operative Hgb

Variable Legend

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Symbol	Meno	Jednotka	Popis
PreHgb	Pre-operative hemoglobin	g/dL	—
PostHgb	Post-operative hemoglobin	g/dL	—
Weight	Body weight	kg	—
BloodLoss	Estimated blood loss	mL	—

How to Estimated Blood Loss

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1EBL = EBV × (HCT_pre − HCT_post) / HCT_avg
2EBV ≈ 70 mL/kg (average adult)
3HCT as decimals (40% → 0.40)
4Clinical estimate only — always correlate with signs

Worked Examples

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Example 1

Given:80 kg, HCT pre 0.42, post 0.30

Výsledok:EBL = 5600 × 0.12/0.36 ≈ 1,867 mL

Real-World Applications

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Surgical blood loss quantification

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Transfusion decision-making

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Fluid replacement planning

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Post-operative bleed assessment

ATLS Blood Loss Classes

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Class	Volume	Key sign
I	< 750mL	Minimal
II	750–1500mL	Tachycardia
III	1500–2000mL	Hypotension
IV	> 2000mL	Life-threatening shock

Frequently Asked Questions

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Why is estimated blood loss important?

Helps surgeons/anesthesiologists assess adequate fluid replacement, need for transfusion, ongoing bleeding risk. Underestimating = inadequate resuscitation; overestimating = unnecessary transfusions.

Is hemoglobin drop a reliable estimate?

Decent proxy. But affected by fluid administered, ongoing losses. Direct measurement (weighing gauze, cell salvage) more accurate. Hemoglobin drop estimates minimum loss.

What about ongoing oozing?

Persistent low-grade bleeding can add up. Monitor hourly drain output post-op. > 200 mL/hr suggests coagulopathy or inadequate hemostasis. Intervention needed.

References

›EBL — StatPearls

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Reviewed October 2026

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