One thing, don't stay on the internet looking for this--let the specialist handle it. Why? Because you'll end up convincing yourself that she has something like leukemia, when it's probably nothing. When women become pregnant, especially in the later stages, they can have white blood cell counts due to a process called "demargination". In terms of your white blood cells, normally you have blood cells that are floating around in your blood, but also those that are sticking to the sides of the inside of your vessels. They can exit through pores in the walls of the vessels in order to reach tissues that need them. When you draw blood, you're mostly getting the blood cells that are floating around in the blood rather than sticking to the side of the vessels. In pregnancy, sometimes more of the white blood cells that are sticking can detach, and when you check the blood, it seems like it's higher. Usually this means nothing. I agree that your wife's WBC count is raised, but it's really not by much, and the hematologist will likely say that there's nothing wrong and all that your wife needs is blood monitoring throughout the pregnancy.