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Polycythemia vera is an abnormal increase in blood cells (primarily red blood cells) due to excess production of the cells by the bone marrow.
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Polycythemia vera (PV) is a chronic blood disorder marked by an abnormal increase in three types of blood cells produced by bone marrow: red blood cells (RBCs), white blood cells (WBCs), and platelets. PV is called a myeloproliferative disorder, which means that the bone marrow is producing too many cells too quickly.
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