William Aird/X
Aug 30, 2026, 16:07
William Aird: Why Does the Mentzer Index Work?
William Aird, Professor of Medicine at Harvard Medical School, shared a post on X:
“Why does the Mentzer Index work?
- MCV/RBC count below 13 suggests thalassemia trait
- MCV/RBC count above 13 suggests iron deficiency
Easy to memorize.
But there’s physiology hiding inside the formula.
Here’s a thought experiment.”

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