An MCV test measures the average size and volume of your red blood cells. Low MCV suggests microcytic anemia, with red blood cells smaller than normal. High MCV suggests macrocytic anemia, with red ...

What Is a RDW Blood Test? An RDW blood test – also known as a red blood cell distribution width blood test – is a measure of the difference in your red blood cells’ size and volume. RDW is one part of ...