On both the bone marrow aspirate and the core biopsy, a hypercellular marrow with an increased myeloid:erythroid ratio of 20:1 or greater. Myelocytes and neutrophils are increased, and blasts and promyelocytes are not increased.
The bone marrow aspirate and core biopsy show a densely packed marrow with an abnormal myeloid to erythroid ratio of 20:1 or higher. There is an increase in immature white blood cells (myelocytes and neutrophils), but not in immature red blood cells or blast cells.