Abstract

In recent years there has been an increasing appreciation by clinicians and laboratory workers that the finer diagnostic value of the differential white count resides in the absolute number of each cell type present rather than the relative values of the different forms. It is customary in many laboratories to report the differential in terms of the actual number of polymorphonuclears, lymphocytes, monocytes and eosinophils instead of the traditional differential percentage figures. The method is of particular significance during infancy and childhood and under pathologic conditions of leukopenia and leukocytosis. The absolute value for each cell type is obtained from the conventional differential count by multiplying the percentage found with the total count. The author has prepared a set of convenient tables for the rapid computation of the actual number of each cell type of white cell per cubic millimeter of blood. The use of the tables is explicitly stated

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