What is the size of red blood cells?

one disc has a diameter of7-8 um 1 um=1/25,000 of an inch or1/10,000 of a centimeter or1/1000 of a millimeter

For normal RBSs normal size is in rage from80 to98 fL. But also, you must always bear in mind that RDW value will give you information is anemia of chronic disease present or is it all about iron deficiency.