Anemia is defined as the number of red blood cells, hemoglobin, and red blood cell pressure volume inside the human blood is lower than the normal value. When patients or doctors get the results of routine blood tests, they should look at the following indicators: 1. Red blood cell count: the normal human red blood cell value is 4.5×10^12-5×10^12/L, which is lower than the normal value, called anemia; 2. Hemoglobin: the normal value for adult males is 120-160g/L, which is lower than the lower limit, called anemia; 3. MCV: also called mean red blood cell volume, which can be anemia into large cell, small cell, and orthocytic anemia, which can initially determine the type of anemia; 4. Reticulocytes: doctors can easily overlook this indicator, which is an indicator reflecting the degree of bone marrow proliferation. If the reticulocyte is increased, it may suggest proliferative anemia. If the reticulocyte is decreased, it may suggest a hyperplastic anemia.