Classification system used for defining 15 categories of cells.

In the figure, Hyper indicates hypergranular cytoplasm; Hypo, hypogranular or agranular cytoplasm; +, the presence of 1 or 2 Auer rods; +++, the presence of 3 or more Auer rods or faggots; Baso G, basophilic granules; Chediak, Chediak-like inclusions; and Pelger, Pelger-like cells.