Doctor, can you help me see if my blood is normal? Doctor, can you help me to see if my blood needs whitening treatment? Doctor, do I need to check my blood picture again after the whitening injection? Doctor, why is my blood still not rising after a few days of whitening injections? Doctor, why do I feel weak and have a fever after chemotherapy recently? Do you ask the doctor the same questions after chemotherapy? Today, I will tell you about monitoring your blood after chemotherapy. The most common adverse effect of chemotherapy is the impact of the bone marrow hematopoietic system, and myelosuppression usually occurs after chemotherapy. The so-called myelosuppression is mainly manifested as a decrease in the number of white blood cells and platelets in the blood picture after chemotherapy, and the degree of decline is related to the survival of white blood cells and platelets. For example, the lifespan of platelets is 5-7 days and granulocytes (75% of total white blood cells) is 6-8 hours. Therefore, the earliest manifestation after chemotherapy is a decrease in leukocytes, followed by platelets. Chemotherapy causes the most common decline in leukocytes and platelets, and there is a pattern of leukocyte and platelet decline. The first degree of leukocyte decline (3.0-3.9), and no tendency to continue to decrease (after the 14th day of chemotherapy), close observation, strengthen nutrition, can take oral restoration of blood picture drugs, such as: blood, shark liver alcohol, ricegold, ascorbic acid, elm ascorbic tablets or Chinese medicine preparations. If your white blood cells drop 2 degrees (2.0-2.9), decide whether to treat with leukostatic injection according to your general condition and the characteristics of the drop in blood count after previous chemotherapy. For leukocyte 3-4 degree decline (less than 1.9), routine use of leukostimulant injection (recombinant human granulocyte colony-stimulating factor G-CSF) can be given 150-300ug (or 2-5ug/Kg body weight) once daily by subcutaneous injection, with daily monitoring of blood picture changes during treatment until neutrophils (white blood cells) return to at least normal values. Caution: Check the blood picture daily during the drug administration and reduce or stop the drug according to the recovery of blood picture. Avoid dosing 24-48 hours before and after chemotherapy. When the blood picture drops significantly, leukocyte 4 degree drop (less than 1.0), granulocyte deficiency fever, should: 1. protective isolation; 2. give sufficient granulocyte colony-stimulating factor treatment; 3. broad-spectrum antibiotic anti-infection treatment; 4. review blood picture every other day; 5. strengthen oral hygiene, perianal cleaning and other protection; 6. avoid eating raw and cold food; 7. closely observe water intake to avoid dehydration; 8. monitor basic diseases (hypertension, diabetes, heart disease, etc.). The decrease of platelets after chemotherapy is mostly seen in the regimen containing paclitaxel and carboplatin. 1-2 grade thrombocytopenia can be observed and not treated with drugs. 3-4 grade thrombocytopenia can be treated with drugs such as interleukin-11 and thrombopoietin, and platelet transfusion if necessary. Chemotherapy usually does not have serious red blood cell decline, you can pay more attention to diet, iron supplements, etc.