Is Polyglycemia Vera hereditary?

Occurs in one to five of every 100,000 people. With this Blood disorder, patients not only have more red cells, that is, hematocrits can almost double in some cases, but there is also a slow, steady buildup of white cells and platelets. Blood volume also increases, which masks the disease from the doctor while putting the patient at a higher risk of Blood clots and stroke. Women under the age of 40 are at particular risk for clotting complications.