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Printed on 4/19/2026
For informational purposes only. This is not medical advice.
The Mentzer Index is a simple screening ratio derived from CBC values in patients with microcytic anemia. It helps triage whether iron deficiency or thalassemia trait is more likely before confirmatory iron studies and hemoglobin electrophoresis.
Formula: Mentzer Index = MCV (fL) / RBC count (million/uL).
Lower index values tend to align with thalassemia trait patterns, while higher values more commonly align with iron deficiency patterns.
Use this calculator in microcytic anemia evaluation as an initial triage tool before targeted confirmatory testing.
Mentzer Index is not diagnostic and can be misleading in mixed etiologies (e.g., concurrent iron deficiency and thalassemia trait) or transfusion states.
For related assessments, see NLR Ratio, 4T Score (HIT) and DIC Score.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
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