To check blood routine, it is best to register with the Department of Hematology because it is a specialized department for the diagnosis and treatment of various blood system diseases and has the most professional and comprehensive analysis of blood routine. This is because in blood routine, it is possible to find out whether the number of white blood cells is normal, whether the ratio of various cells in white blood cells is normal, and also whether the number of red blood cells is normal and whether there is anemia. If the patient has anemia, whether it is small cell anemia or large cell anemia, so that a general judgment can be made about the type of anemia. In addition, it is possible to find out whether the platelet count is normal; whether the platelets are increased or decreased; if the platelets are decreased, what is the possible cause, whether it is caused by immune factors or medications; if the platelets are increased, whether it is a reactive increase or a primary increase, all of which can give okay guidance to the patient. Therefore, it is better to go to the hematology department if the blood is checked.