However, the reference range can vary based on the lab. If your RDW blood test is high, it means there is a greater variation in the size of your red blood cells. This is called anisocytosis. A high ...
“There is a misconception that there’s nothing we can do about it—that’s not true.” Once you get an evaluation, a doctor will usually order a blood test to check for a vitamin B12 deficiency, along ...