<Dl> <Dd> RDW - CV = (Standard deviation of MCV ÷ MCV) × 100 . </Dd> </Dl> <Dd> RDW - CV = (Standard deviation of MCV ÷ MCV) × 100 . </Dd> <P> Anemia in the presence of a normal RDW may suggest thalassemia . A low Mentzer Index, calculated from CBC data (MCV / RBC <13), may suggest this disorder but a hemoglobin electrophoresis would be diagnostic . </P> <P> Iron - deficiency anemia usually presents with high RDW and low MCV . </P>

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