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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 normal red blood cell distribution width in children will be slightly different. The RDW test results for children should be between 12% and 14% depending on their age. 2 . What RDW Blood Test Can Tell About Your Health. High and normal RDW levels in a blood test can help to tell a lot about your health.