Red Cell Distribution Width (RDW)
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Std Dev of MCV
MCV
R e s u l t s
RDW
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Red Cell Distribution Width (RDW)
RDW=

[Stand Dev of MCV x 100] / MCV

 

Statistical description of heterogeneity of red cell size. Increases with anisocytosis. Increased in reticulocytosis, iron deficiency, newborns. Normal in thalassemia minor.

 

Normal =11.5-14.5%