RT Book, Section A1 Lichtman, Marshall A. A1 Kaushansky, Kenneth A1 Kipps, Thomas J. A1 Prchal, Josef T. A1 Levi, Marcel M. SR Print(0) ID 1126651876 T1 Polyclonal Polycythemias (Primary and Secondary) T2 Williams Manual of Hematology, 8e YR 2011 FD 2011 PB McGraw-Hill Education PP New York, NY SN 9780071622424 LK hemonc.mhmedical.com/content.aspx?aid=1126651876 RD 2024/04/16 AB Polycythemia (also known as erythrocytosis) is characterized by an increased red cell blood volume. Polycythemias can be primary or secondary and either inherited or acquired.Classification of polycythemic disorders appears in Table 2–2 in Chap. 2.Primary polycythemias are caused by somatic or germline mutations causing changes within hematopoietic stem cells or erythroid progenitors causing an augmented response to erythropoietin.Secondary polycythemias are caused by either an appropriate or inappropriate increase in the red cell mass as a result of augmented levels of erythropoietin.