Abstract
The red cell distribution width (RDW) is a standard variable reported in the complete blood count. It has been found to have a consistent relationship to life expectancy in older individuals, prognosis in patients with cardiovascular disease, outcome in those with hematological and non-hematological neoplasms and in a variety of medical circumstances such as non-cardiovascular or cancer related critical illness and postoperative outcome from various procedures. This report reviews some of the key medical publications establishing these relationships with RDW. The precise pathobiological processes that explain the predictive value of the RDW in this wide array of circumstances or why an alteration in erythropoiesis (exaggerated red cell size variation) occurs is uncertain. The possible role of inflammation has been one hypothesis considered, but not established.
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