Amber Essenmacher, PA-C, MMS, a physician assistant specializing in rare, chronic blood cancers called myeloproliferative neoplasms (MPNs), talks about how blood counts may affect clotting risk for people with polycythemia vera (PV). She reviews how different blood counts can affect risk of blood clotting, a serious complication in patients with PV. She suggests an online tool that may help patients with PV track their blood counts. To learn about an online resource that can help patients with PV track their blood counts, symptoms, and medical procedures, visit https://www.voicesofmpn.com/mpn-tracker-tools.aspx. Sponsored by Incyte Corporation. © 2019, Incyte Corporation. MAT-HEM-00525 02/19