There are three main indicators of anemia in blood tests, namely red blood cell count (RBC), hemoglobin (HGB) and red blood cell pressure (HCT). The normal value of hemoglobin content is 120-150g/L, and less than 120g/L is anemia. There are three categories of anemia: mild anemia is generally 90-120g/L; moderate anemia is generally 60-90g/L; severe anemia is generally 30-60g/L; and very severe anemia is <30g/L. The degree of anemia is also judged by its own situation, and there are differences in hemoglobin content between men and women, such as hemoglobin in women with physiology and chronic blood loss. It may also be lower than normal.