Polycythemia Vera is not hereditary. Polycythemia Vera (PV) a rare and serious, blood disorder that can be deadly if not diagnosed and treated properly.Polycythemia Vera (PV) or Primary Polycythemia is a blood disorder in which bone marrow makes too many red blood cells.The symptoms of Polycythemia Vera are not visible for many years and it develops very slowly. Lots of people find out about their PV from blood tests done for other reasons.olycythemia Vera is not hereditary. Polycythemia Vera (PV) a rare and serious, blood disorder that can be deadly if not diagnosed and treated properly.