An adult should have a normal WBC range of 4,500-11,000 WBC/mcL or 4.5-11.0 x 10^9 per liter, which is 1 percent of the total volume of blood in the body. What’s the specific number of your WBC count? Is your WBC number below the normal range? And do you have any conditions that may lead to it? Treatments depend on the causes. For instance, the white cell count generally falls below the normal range about seven to ten days after a chemotherapy treatment and recovers within about a week after that. The only treatment that has been proved to increase the number of white blood cells after chemotherapy is an injectable medicine that stimulates the bone marrow to make white blood cells faster.