Iron Deficiency Calculator: TSAT, Ferritin and Ganzoni Deficit

TSAT = iron / TIBC × 100%. Ganzoni model: weight × (15 − Hb in g/dL) × 2.4 + 500 mg for weight ≥ 35 kg. It is displayed only when both Hb and ferritin are below the selected thresholds.

Free · No registration or payment

Calculation

Sex
Serum iron — Units
What your report shows

Enter measured CRP. Zero is not a substitute for a missing test. At CRP > 5 mg/L, the ferritin reference threshold is 70 µg/L (WHO 2020).

Result

Interpretation
Pattern not classified; these thresholds do not exclude a diagnosis
Transferrin saturation (TSAT)
12.5 %

A value < 20% is used as a reference in several clinical conditions; interpretation depends on context.

Ferritin threshold for deficiency
15 µg/L

WHO 2020: < 15 µg/L in adults without inflammation. This is not a universal clinical threshold for every condition.

Total iron deficit (Ganzoni)
Not calculated: this model requires both Hb and ferritin below the selected thresholds.

TSAT = iron / TIBC × 100%. Ganzoni model: weight × (15 − Hb in g/dL) × 2.4 + 500 mg for weight ≥ 35 kg. It is displayed only when both Hb and ferritin are below the selected thresholds.

TIBC used
72.0 µmol/L
Serum iron
9.0 µmol/L

These are descriptive biomarker patterns, not diagnoses. Hb thresholds: 130 g/L for men and 120 g/L for nonpregnant women; WHO 2020 ferritin: 15 µg/L, or 70 µg/L at CRP > 5 mg/L. Ganzoni target Hb, weight and stores need individual selection; the result is not a medicine dose. Reference ranges are population benchmarks from the cited sources. Laboratories use their own ranges, and interpretation depends on clinical context: discuss the result with your physician.

The result updates as you change the fields. Your data never leaves the browser.

Only upon clicking, current data is sent to generate the PDF and is not stored.

How it is calculated

TSAT = iron / TIBC × 100%. Ganzoni model: weight × (15 − Hb in g/dL) × 2.4 + 500 mg for weight ≥ 35 kg. It is displayed only when both Hb and ferritin are below the selected thresholds.

Formula

TSAT = iron / TIBC × 100%. Ganzoni model: weight × (15 − Hb in g/dL) × 2.4 + 500 mg for weight ≥ 35 kg. It is displayed only when both Hb and ferritin are below the selected thresholds. TIBC (µmol/L) = transferrin (g/L) × 25.1. Iron: µg/dL × 0.179 = µmol/L. Hb: g/L ÷ 10 = g/dL.

Limits of the method

These are descriptive biomarker patterns, not diagnoses. Hb thresholds: 130 g/L for men and 120 g/L for nonpregnant women; WHO 2020 ferritin: 15 µg/L, or 70 µg/L at CRP > 5 mg/L. Ganzoni target Hb, weight and stores need individual selection; the result is not a medicine dose.

Sources of the method

This calculation is for reference only and is not medical advice, a diagnosis or a prescription. If you have a medical condition, are pregnant, take medication or have any doubts, discuss the result with a physician or a qualified nutrition professional.

How to use the calculation

1

Enter the starting values

TSAT = iron / TIBC × 100%. Ganzoni model: weight × (15 − Hb in g/dL) × 2.4 + 500 mg for weight ≥ 35 kg. It is displayed only when both Hb and ferritin are below the selected thresholds.

2

Adjust the parameters

TSAT = iron / TIBC × 100%. Ganzoni model: weight × (15 − Hb in g/dL) × 2.4 + 500 mg for weight ≥ 35 kg. It is displayed only when both Hb and ferritin are below the selected thresholds. TIBC (µmol/L) = transferrin (g/L) × 25.1. Iron: µg/dL × 0.179 = µmol/L. Hb: g/L ÷ 10 = g/dL.

3

Read the result

These are descriptive biomarker patterns, not diagnoses. Hb thresholds: 130 g/L for men and 120 g/L for nonpregnant women; WHO 2020 ferritin: 15 µg/L, or 70 µg/L at CRP > 5 mg/L. Ganzoni target Hb, weight and stores need individual selection; the result is not a medicine dose.

Frequently asked questions

What does the calculation show?

TSAT = iron / TIBC × 100%. Ganzoni model: weight × (15 − Hb in g/dL) × 2.4 + 500 mg for weight ≥ 35 kg. It is displayed only when both Hb and ferritin are below the selected thresholds.

What limitations apply?

These are descriptive biomarker patterns, not diagnoses. Hb thresholds: 130 g/L for men and 120 g/L for nonpregnant women; WHO 2020 ferritin: 15 µg/L, or 70 µg/L at CRP > 5 mg/L. Ganzoni target Hb, weight and stores need individual selection; the result is not a medicine dose.

Related calculators

Related tools.

Diet and lifestyle checklist →Lab Unit Converter →Protein reference intakes →Vitamin D: van Groningen model estimate →

Other calculators

Lab tests and metabolic health

What next

Formula breakdowns, biomarker reference ranges and nutrition articles with cited sources are in the NutriFit knowledge base.

Go to the knowledge base