White blood cells are usually below 2.0×10⁹ can consider leukapheresis injection. White blood cells are an important indicator in the blood routine, leukopenia is when white blood cells are persistently lower than normal, white blood cell count below 2.0×10⁹ or less is leukocyte deficiency, at this time, the body’s resistance is reduced, the risk of infection is high. Recombinant human granulocyte colony-stimulating factor (G-CSF) is commonly known as leukapheresis. Leukapheresis injection is mainly used in tumor patients with leukopenia after chemotherapy and radiotherapy to help patients shorten the duration of leukopenia and reduce the risk of secondary infections due to leukopenia. Adverse reactions include rash, fever, etc. This drug is contraindicated in patients who are allergic to this product. Specific medication should follow the doctor’s instructions. It is recommended to pay attention to rest, avoid cold and flu, so as not to aggravate the condition.