In routine blood test, the white blood cell is 3.4×10⁹/L, which is lower than the normal range (34~10×10⁹/L), and the causes include viral infections, immune system diseases, medication factors, and hematological system diseases.
1. Viral infections: such as influenza, viral pneumonia, etc. Viruses can cause low immune function and symptoms of low white blood cells, usually after the viral infection improves, white blood cells can return to normal.
2. Immune system diseases: such as systemic lupus erythematosus, ankylosing spondylitis, etc., can also cause white blood cell decline.
3. Drug factors: such as taking antipyretic and analgesic drugs, sulfonamides, etc., may cause low white blood cells, and other tests are normal, you can stop using the above drugs for one week to review the blood routine.
4. Blood system diseases: granulocyte deficiency, aplastic anemia will also appear in the blood routine leukocytes are low.
If the white blood cells are lower than the normal range, but other tests are normal, the patient’s clinical symptoms and medication history should be taken into consideration to see if further examination and treatment are needed.