basic

Mentzer Index (MCV / RBC) Microcytic Anemia Calculator

Mentzer = MCV / RBC; > 13 favours IDA, < 13 favours β-thal trait.

Compute the Mentzer Index — a quick microcytic anaemia discriminator — from MCV (fL) divided by RBC count (×10⁶/µL). > 13 suggests iron-deficiency anaemia (IDA); < 13 suggests beta-thalassemia trait. Around 13 is indeterminate; further work-up needed.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

fL
×10⁶/µL

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Mentzer = MCV / RBC.

In depth

Compute the Mentzer Index — a quick microcytic anaemia discriminator — from MCV (fL) divided by RBC count (×10⁶/µL). > 13 suggests iron-deficiency anaemia (IDA); < 13 suggests beta-thalassemia trait. Around 13 is indeterminate; further work-up needed.