What's the rdw in hematology?

Indices: Rdw refers to red cell distribution width. When the level is high or low, it makes us think of different disorders. For example, a high level can be seen in liver disease and B12 deficiency. A low level can be seen in iron deficiency. Hope this helps.

RBC size variation: Rdw is a a statistical measurement of the differences in size of the red blood cells (rbc). Higher RDW values mean that there is more variation in the sizes of the rbc. Iron deficiency anemia is associated with increased rdw, especially after iron replacement starts.