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Hb vs Hct: Who’s in charge? – William Aird
May 5, 2026, 13:58

Hb vs Hct: Who’s in charge? – William Aird

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

”Hb vs Hct: Who’s in charge?

Anemia?

Think Hb. Polycythemia?

Think Hct. At equipoise?

Dealer’s choice. (I lean Hb; call me an optimist)

Because O₂ delivery is a tradeoff: carrying capacity (Hb) vs flow (Hct).”

Hb vs Hct: Who's in charge? - William Aird

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