Increased circulating immature neutrophil count 2019-01-26T17:21:30Z Various forms of immature neutrophils appear during granulopoiesis in the bone marrow. A seven day mitotic stage (myeloblast to promyelocyte to myelocyte) is followed by a seven day maturation stage (myelocyte to metamyelocyte to band cell to mature segmented neutrophil). Mature neutrophils are normally held in storage pools in the bone marrow before their entry into the circulation. An abnormally increased number of immature neutrophils in the peripheral blood circulation. Abnormal granulocyte count