William Aird/X
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.”

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