No special preparation is necessary. The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. Afterward, there may be some throbbing . B-type lymphocytes synthesize and secrete antibodies . Cytotoxic T lymphocytes recognize and destroy virus-infected cells.
Monocytes recognize a variety of microorganisms, especially gram-negative bacteria.
Activated monocytes turn into macrophages that can engulf and destroy microorganisms and secrete a variety of cytokines that modulate the activity of other leukocytes. Eosinophils and basophils release substances that cause vasoconstriction , smooth muscle contraction , and an increased permeability of small blood vessels. Eosinophils are stimulated by parasites and some bacteria. Basophils are stimulated by allergens. It is important to realize that an abnormal increase in one type of leukocyte will produce an apparent decrease in the percentage of other types.