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Health Conditions Discover Plan Connect. What Is Leukocytosis? Types of leukocytosis. Symptoms of leukocytosis. Causes of leukocytosis. Leukocytosis in pregnancy. How leukocytosis is diagnosed. Treatment for leukocytosis. Prevention of leukocytosis. Read this next. Medically reviewed by Deborah Weatherspoon, Ph.
An increase in white blood cells is known as leukocytosis. It typically occurs in response to the following conditions:. Certain respiratory conditions, such as a whooping cough or tuberculosis , may cause the levels of white blood cells to increase.
In some cases, all white blood cells become affected. However, some people have a specific disease in which only one type of white blood cell is affected. If levels of one particular type of white blood cell increase, this may be due to a specific trigger:. There is, on occasion, no identifiable cause for the increase in white blood cells. This is known as idiopathic hypereosinophilic syndrome. It can lead to serious complications, such as damage to the heart, lung, liver, skin, and nervous system.
White blood cell levels increase significantly during healthy pregnancy because of the physical stress the body endures during this time. The levels start to rise within the first trimester and continue to rise into the third trimester. During labor and in the hours following delivery, white blood cell levels may surge again, to between 9, and 25, white blood cells in every microliter of blood.
This is in response to the physical stresses and trauma of labor. Within 6—8 weeks of delivery, white blood cells return to their normal levels. A doctor may use a blood test to determine levels of white blood cells.
If levels of white blood cells are lower than usual, this may be a sign that the person has reduced immune activity. When infecting microorganisms are multiplying in the blood or tissues, the bone marrow is stimulated to increase its activity.
It begins producing extra white blood cells to fight the infection. Because infection can also lead to inflammation and white cells are produced in response to this, the inflammatory response itself can also be associated with an increase in white blood cell count.
Overall, the most common cause for a high white blood cell count is response to infection. Another potential cause of an elevated white blood cell count is leukemia. This is effectively a cancerous change of the blood and bone marrow which causes significant overproduction of white blood cells.
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