Causes of abnormal WBC-
1-Viral infections that temporarily disrupt the work of bone marrow
2-Certain disorders present at birth (congenital) that involve diminished bone marrow function
3-Cancer or other diseases that damage bone marrow
4-Autoimmune disorders that destroy white blood cells or bone marrow cells
5-Severe infections that use up white blood cells faster than they can be produced
6-Medications, such as antibiotics, that destroy white blood cells
7-Sarcoidosis (collections of inflammatory cells in the body)