Related to leukocytosis: digestive leukocytosis. Leukocytosis is a condition characterized by an elevated number of white cells in the blood. Leukocytosis is a condition that affects all types of white blood cells. Other illnesses, such as neutrophilia, lymphocytosis, and granulocytosis, target specific types of white blood cells. Normal white blood cell counts are 4,300-10,800 white blood cells per microliter.