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THE IMPORTANCE OF HEMATOLOGIC INVESTIGATIONS.

JAMA. 1903;XLI(20):1212-1213. doi:10.1001/jama.1903.02490390036009.
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The number of those who decry the importance of blood examinations as a diagnostic measure is progressively diminishing, while the number of physicians who include a hematologic investigation among their clinical assets is as progressively increasing. It is not only the enumeration of the erythrocytes and the leukocytes and the estimation of the hemoglobin percentage that are of importance, but also a knowledge of the morphologic characteristics of the dried and stained films is frequently necessary for a satisfactory diagnosis. In some instances, although the blood may show no absolute leukocytosis, stained specimens show a relative leukocytosis of the first importance. In the case recently reported by Kelly1 of a man who complained of weakness and who presented, on physical examination, slight jaundice, great enlargement of the spleen, moderate enlargement of the liver and leukoderma, a blood examination showed only 9,000 leukocytes. A differential count, however, showed that 98

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