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February, 2026
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Understanding ESR: Dr. William Aird Breaks Down the Factors Behind Sedimentation Rate Changes
Aug 2, 2025, 17:44

Understanding ESR: Dr. William Aird Breaks Down the Factors Behind Sedimentation Rate Changes

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

WHAT DETERMINES THE ESR?

↑ ESR: ↑ fibrinogen, ↑ immunoglobulins, ↓ Hct

↓ ESR: poikilocytosis, ↓ RBC deformability, ↑ Hct, ↑ plasma viscosity

Red cell stacking speeds it up. Resistance slows it down.”

William Aird

Read The Blood Project here.

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