High Red Blood Cell Width Predicts Severe COVID-19 Risk, Harvard Study Finds

Study conducted during early COVID-19 pandemic when global deaths were approaching one million, with elevated mortality rates among elderly and immunocompromised populations.

As the pandemic's death toll approached one million in late 2020, medicine was still searching for reliable signals amid the uncertainty of who would survive hospitalization. A Harvard research team found one such signal in an overlooked corner of routine blood work: the variation in size among a patient's red blood cells. Their study of 1,641 patients across Boston hospitals revealed that this ordinary measurement — red blood cell distribution width, or RDW — carried an extraordinary predictive weight, pointing toward mortality risk long before clinical deterioration became visible to the eye

High Red Blood Cell Width Predicts Severe COVID-19 Risk, Harvard Study Finds

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