Normal blood white blood cells does not mean there is no problem, but also combined with hemoglobin, platelets and other indicators, comprehensive judgment. Blood routine examination, white blood cell count is only one of the items, increase and decrease all help to diagnose the disease, but some diseases, white blood cells may be normal, so also need to combine with other items in the blood routine. Commonly, as in anemia, blood tests may indicate a lowered red blood cell count and low hemoglobin levels, but the white blood cell count and ratio may be normal. In idiopathic purpura, blood counts may indicate a decreased platelet count, but white blood cells and red blood cells or hemoglobin may be normal. Some viral infections, can also appear white blood cell number is normal, but the proportion of lymphocytes may rise, blood routine in the white blood cells is normal, does not mean that there is no problem, it is recommended that timely medical treatment, standardized treatment.