|Title of host publication||Encyclopedia of Behavioural Medicine|
|Number of pages||1|
|Publication status||E-pub ahead of print - 21 Jan 2020|
Lymphocytosis is an increase in the number of lymphocytes, usually measured in peripheral blood. In the absence of disease, this increase in cell number is normally caused by a transient mobilization or migration of lymphocytes into the circulation, rather than an increase in cell division.