Erythrocyte Distribution Width Measurement

**Semantic type:** Laboratory Procedure

**Definition:** An index of the variation in the size of the red cells and can be used to detect subtle degress of anisocytosis. It is computed directly from the RBC histogram and is calculated as a standard statictical value, the coefficient of variation of the red cell volume ditribution (ratio of standard deviation and mean copuscular volume).

**Synonyms:** - Erythrocytes Distribution Width - Erythrocytes Distribution Width - RDW - RDW-CV - Red Blood Cell Distribution Width - Red Cell Volume Distribution Width