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| | > 26% || Severe anisocytosis | | | > 26% || Severe anisocytosis |
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| High RDW may be a result of the presence of fragments, groups of agglutination, and/or abnormal shape of red blood cells.<ref name="Medscape Reference 2017">{{Cite web |title=Red Cell Distribution Width (RDW): Reference Range, Interpretation, Collection and Panels |url=https://emedicine.medscape.com/article/2098635-overview |last1=Curry |first1=Choladda Vejabhuti |date=2017-01-07 |website=Medscape Reference |access-date=2019-05-18}}</ref>
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| *Iron-deficiency anemia usually presents with high RDW and low MCV.
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| *Folate and vitamin B<sub>12</sub> deficiency anemia usually presents with high RDW and high MCV.
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| *Mixed-deficiency (iron + B<sub>12</sub> or folate) anemia usually presents with high RDW and variable MCV.
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| *Recent hemorrhages typically present with high RDW and normal MCV.
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| *A false high RDW reading can occur if [[EDTA]] [[anticoagulated blood]] is used instead of [[citrated blood]]. See [[Pseudothrombocytopenia]].
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| '''Schistocytes''' (fragmented parts red blood cells) only needs mentioning if constituting over 1% of red blood cells. | | '''Schistocytes''' (fragmented parts red blood cells) only needs mentioning if constituting over 1% of red blood cells. |
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| {{Bottom}} | | {{Bottom}} |