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Red blood cell distribution width (RDW or RDW-CV or RCDW and RDW-SD) is a measure of the range OF variation of red blood cell (RBC) volume that is reported as part of a standard complete blood count. Usually red blood cells are a standard size of about 6-8 Î¼m in diameter.
RDW BLOOD TEST. 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. It is used with the MCV (mean corpuscular volume) test results to better determine types of anemia. Normally red blood cells are between six to eight micrometers in diameter (a micrometer is one millionth of a meter and its symbol is Î¼m).