What’s wrong with white blood cells 2.6? First of all, understand that the normal range of white blood cells is in (4.0-10.0)x10^9/L, below 4 is low white blood cells, and now the white blood cells is 2.6.So what causes low white blood cells? The common ones are generally influenza, viral hepatitis, chicken pox, rubella, all of which can cause lowered white blood cells. There are also long-term exposure to radiation or various physical and chemical factors leading to poisoning or tumor radiotherapy, hypersplenism, autoimmune diseases, blood diseases such as aplastic anemia, myelofibrosis drugs and other causes of leukopenia.