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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.
An RDW test is a red cell distribution width test, which is one of the parameters measured in blood tests, states Medscape. Higher RDW results mean that the patient's red blood cells have a greater variation in size or volume.