Leukocytes 2.8×10⁹/L means that the number of white blood cells per milliliter of blood is 2,800, which belongs to the condition of low white blood cells. Low white blood cell alone is not serious, but if it is accompanied by other abnormalities, it is relatively serious. 1. White blood cell 2.8×10⁹/L may be related to infection, trauma, blood diseases, and adverse reactions to chemotherapy drugs. If the white blood cell count is low and not accompanied by other abnormalities in the blood count, it is usually not serious. It is commonly caused by infections or adverse reactions to medications, and is usually easy to return to normal. 2. If the white blood cell count is 2.8×10⁹/L, and accompanied by other indicators such as hemoglobin, platelets and other abnormalities, it is relatively more serious, and we need to be vigilant for the occurrence of blood diseases, such as acute leukemia, myelodysplastic syndromes and so on. It is recommended to combine other indicators, as well as other examination programs for diagnosis, and if necessary, take targeted treatment measures under the guidance of physicians. Meanwhile, nutritional intake should be ensured and rest should be strengthened.