blood test what does rdw - sd mean
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-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.