CBC
Chem 7
ESR
EPO decreased
Bone marrow biopsy sometimes needed
Criteria 1: All category A
Criteria 2: First 3 of category A and any 2 of category B
Polycythemia vera
Primary polycythemia 
Aplastic anemia
Essential thrombocytosis
Essential thrombocytosis 
Myelofibrosis
Chronic myelogenous leukemia 
Immune thrombocytopenic purpura