M:E ratio

the ratio of myeloid to erythroid precursors in bone marrow; normally varying from 2:1 to 4:1

Description
An increased M:E ratio is found in infections, chronic myelogenous leukemia or erythroid hypoplasia, while a decreased ratio may mean a depression of leukopoiesis or normoblastic hyperplasia, depending on the overall cellularity of the bone marrow.