Definition

• Lymphocytosis is an increase in the peripheral blood lymphocyte concentration.
• It is defined as an absolute lymphocyte count > 4.0 x 10⁹/L in adults and 7.0 x 10⁹/L in children
• Relative lymphocytosis is defined as > 45% peripheral blood lymphocytes in adults and > 70% lymphocytes in children.

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