Disease	Red blood cells	White blood cells	Platelets	Marrow
Polycythemia vera	Increased	Normal or increased	Normal or increased	Hypercellular
Chronic myelogenous leukemia	Normal or increased	Increased	Normal or increased	Hypercellular
Myelofibrosis	Normal or decreased	Variable	Variable	Fibrosis
Essential thrombocythemia	Normal or decreased	Slightly increased or normal	Increased	Hypercellular