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There has been an increasing conviction in recent years among clinicians and laboratory workers that the finer diagnostic value of the differential leukocyte count resides in the absolute rather than the relative number of each type of cell present. Consequently many laboratories now report the differential count in terms of the actual number of polymorphonuclear leukocytes, lymphocytes, monocytes and eosinophils, instead of in the traditional percentage figures. This information is of particular significance in cases of illness in infants and children and in cases of leukopenia and leukocytosis. Ordinarily the absolute value for each type of cell may be obtained from the conventional differential count by calculation of the given percentage of the total count. This procedure is time consuming when large numbers of counts are done, and to obviate this the author has prepared a set of convenient tables. Besides providing the reader with tables for rapidly computing the
White Blood Cell Differential Tables.. Am J Dis Child. 1944;68(4):292. doi:10.1001/archpedi.1944.02020100064018