Cellular immune status provides information on the relative and absolute numbers of cell populations (monocytes, granulocytes and lymphocytes) and subpopulations of lymphocytes in the blood. The human body is equipped with a complex defence mechanism whose primary function is to distinguish foreign antigens from the body's own antigens and initiate an appropriate immune response. Historically, innate immunity differs from adaptive immunity, and these systems work closely together. The immune response is mediated by both cellular components (B- and T-lymphocytes, NK cells, macrophages/monocytes, granulocytes and antigen-presenting cells) and humoral components (antibodies, complement factors, cytokines and other soluble effector molecules). [12,13].