What are the limitations of the ganzoni formula?

While the ganzoni formula is highly validated, it should not replace clinical judgment. OpiCalc provides the latest evidence-based limitations for the ganzoni formula to ensure safe bedside use and optimal diagnostic accuracy.

How does the ganzoni formula compare to other hematology scores?

The ganzoni formula is a gold-standard diagnostic tool. OpiCalc provides side-by-side clinical guidance to help clinicians choose the most specific evidence-based tool for their patient's presentation.

Is the ganzoni formula free to use?

Yes. OpiCalc provides the ganzoni formula completely ad-free and optimized for mobile bedside use, ensuring you can calculate medical risk swiftly and without distraction.

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Iron Deficit Calculator (Ganzoni Formula)

Ganzoni Formula: Standard method for estimating the total iron dose needed to correct anemia and replenish iron stores. Note: Individual products may have specific dosing maximums.

Weight (kg)

Actual Hb (g/dL)

Target Hb (g/dL)

Iron Stores (mg)

Guidelines & Evidence

Clinical Details

Section 1

When to Use

Clinical Use

Calculating total iron deficit in patients with iron deficiency anemia (IDA).

Determining the total dose of parenteral (IV) iron required for replacement.

Section 2

Formula & Logic

Calculation

Total Iron Deficit (mg) = Body Weight (kg) × (Target Hb - Actual Hb) (g/dL) × 2.4 + Iron Stores (mg)

Parameters

Factor 2.4: Derived from blood volume (approx 7% of body weight) and Hb iron content (0.34%).

Target Hb: Usually 15 g/dL (or 13 g/dL depending on local guidelines).

Iron Stores: Usually 500 mg (if body weight > 35 kg).

Last Comprehensive Review: 2026

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