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Definition of Red cell distribution width

Red cell distribution width: A measurement of the variability of red blood cell size. Higher numbers indicate greater variation in size. The normal range for the red cell distribution width (RDW) is 11 - 15. The RDW is a standard part of the complete blood count.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=9996
Last Editorial Review: 6/14/2012

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