bloody haematology

myeloproliferative disorder = a set of clonal stem cells disorders involving proliferation of all or some of the blood element and often with a prolonged clinical course. e.g. the entities polycythaemia rubra vera , myelofibrosis, CML, essential thrombocytopaenia and others..

polycythaemia = increase in total RBC mass in blood

relative polycythaemia = haemoconcentration due to dehydration, for instance..