Chapter 51 Elevated or Depressed White Blood Cell Count
ETIOLOGY
How Do White Blood Cells Vary with Age?
At birth, an infant’s WBC count is high and the differential shows a predominance of neutrophils. This neutrophilic predominance is brief, and by 1 month of age the lymphocytes predominate. The WBC count and differential pattern become similar to that of an adult during early adolescence (Table 51-1). Both leukocytosis and leukopenia can indicate infectious, immunologic, or malignant processes (see Chapter 63 for leukemia).
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