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RDW-CV and RDW-SD are a measurement of the size of red blood cells, according to Med-Health.net. RDW-SD is an actual measurement, while RDW-CV involves some calculations using the RDW-SD deviation.
The red blood cell distribution width (âRDWâ) test is normally done when the complete blood count is ordered by the health practitioner. The RDW test measures the variations in size of red blood cells.