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 ...
Medically reviewed by Michael Menna, DO Key Takeaways The MCV test measures the size of your red blood cells.A normal MCV for adults is between 80 and 100 femtoliters.MCV levels can indicate ...