White Blood Cells (WBCs)

This test measures the total number of white blood cells (WBCs). There are 5 main types of WBCs: neutrophils, eosinophils, basophils, monocytes, and lymphocytes. Each type does a slightly different job. All of them help fight infection.

WBCs are produced in the bone marrow, an area in the middle of many bones. Low WBC "counts"may develop as a side effect of interferon treatment. A low WBC count may be caused by cirrhosis of the liver, alcohol use, medications, or other medical conditions.