Methods of identifying altered leukocyte profiles are disclosed. In one embodiment, counts or relative percentages of leukocyte cell types are received and constitute input data points. Combinations of input data points are generated. Pairs of input data points and combinations are generated. Secondary data values are generated from the pairs. Three-dimensional plots are then constructed and selected as useful for identifying an altered leukocyte profile through pattern recognition of perpendicular data inflection, data bifurcation, non-overlapping data clusters, or combinations thereof. Such a strategy results in partially or totally non-overlapping data subsets, which are then interpreted.