It is best to register with the Department of Hematology for routine blood tests, because routine blood tests are a method of examining the number, shape and proportion of various blood cells in peripheral blood by using a hematology analyzer, which can detect and indicate some blood system diseases. The department of hematology is specialized in diagnosing and treating various blood system diseases, including various anemic diseases, various bleeding diseases and common malignant blood system diseases. For example, if a routine blood test reveals that a patient has anemia, and the average volume of red blood cells, the average amount of red blood cells hemoglobin, and the average concentration of red blood cells hemoglobin are all significantly lower, we should highly suspect whether it is iron deficiency anemia, and ask the patient to test serum iron and ferritin again, and if the concentration of serum iron and ferritin decreases, the diagnosis of iron deficiency anemia can be confirmed, so it is best to register with the hematology department for routine blood test.