Iron Deficit Calculator (Ganzoni)
Iron Deficit Calculator (Ganzoni) - a deterministic tool in Sophie Well's Medication & Infusion group.
Open the Iron Deficit Calculator (Ganzoni) → Runs in your browser. No signup, no tracking.
What this is
Apply the Ganzoni equation (Ganzoni 1970) to estimate total body iron deficit in milligrams from body weight, current hemoglobin, and target hemoglobin: deficit = weight(kg) * (target Hb - current Hb) * 2.4 + iron stores (typically 500 mg in adults). Sophie Well returns the total deficit so the prescriber can compare it to a single-dose IV iron formulation's maximum dose and plan one or two infusions instead of guessing.
When to use it
Use this when ordering IV iron for iron-deficiency anemia where the patient cannot tolerate, has failed, or has malabsorption issues with oral iron. The Ganzoni number tells you whether the patient needs a single 1000 mg ferric carboxymaltose infusion, a split course, or a higher cumulative dose. It is not a substitute for confirming iron deficiency by ferritin and transferrin saturation before treating.
References
Ganzoni AM. Schweiz Med Wochenschr 1970;100:301-303.
Worked example: Total iron deficit 1508 mg (1008 mg + 500 mg stores).
Sophie Well is a reference and educational tool. Not medical, legal, or financial advice. Does not replace clinician judgment, professional billing review, or legal counsel.