Our hematologists stipulate that at sea level, anemia can be diagnosed in adult males with a hemoglobin concentration of less than 120 g/L, an erythrocyte pressure product of less than 40%, and a number of erythrocytes in peripheral blood of less than 4 million/mL. In adult females, hemoglobin below 110g/L, erythrocyte pressure product below 37%, and the number of erythrocytes in peripheral blood below 3.5 million/mL can be diagnosed as anemia. So there are gender differences in anemia, and there are also regional differences, as specified by our hematologists in the sea level area. In high altitude areas, the hemoglobin concentration of adults is usually above 160-180 g/L. Therefore, the diagnostic criteria for anemia are different for different regions and different genders. When analyzing the patient’s hemoglobin concentration, red blood cell count and red blood cell pressure, it is important to take into account the specific situation of the patient and the living environment.