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William Aird: Ferritin as a Probability Signal
Apr 18, 2026, 18:55

William Aird: Ferritin as a Probability Signal

William Aird, Professor of Medicine at Harvard Medical School, shared a post on X:

”Ferritin as a probability signal

Less than twenty means iron deficiency is essentially certain

Around one hundred means iron deficiency is unlikely

In inflammation:

  • The extreme values still apply.
  • The middle range changes interpretation.”

William Aird: Ferritin as a Probability Signal

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