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William Aird: Why Does the Mentzer Index Work?
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.”

William Aird

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