The white blood cell 3.4×10^9/L is lower than the normal range, but the degree is not serious. The causes include viral infection, serious infection, autoimmune disease, blood system disease and so on.
Normal white blood cells are usually (4~10)×10^9/L. If the white blood cells are 3.4×10^9/L, which is slightly lower than the normal range, the causes of low white blood cells include viral infections, serious bacterial infections, autoimmune diseases, and blood system diseases.
1. Viral infections: If symptoms such as fever, runny nose and cough occur, they may be caused by viral infections, and the symptoms of low white blood cells are usually not treated, and after the condition is stabilized, the routine blood test will be conducted again.
2. Severe bacterial infection: severe bacterial infection may cause low white blood cell count.
3. Autoimmune diseases: autoimmune diseases such as systemic lupus erythematosus may cause low white blood cell count due to excessive destruction of white blood cells.
4. Blood system diseases: such as aplastic anemia, myelodysplastic syndrome, etc. If accompanied by platelet abnormality or white blood cells continue to fall, it is necessary to improve the bone marrow aspiration examination to exclude blood system diseases.
The diagnosis and treatment of specific diseases should be carried out under the guidance of physicians.