The examination of serum ferritin and hemoglobin in pregnant women is the most sensitive indicator. When the serum ferritin is lower than 12 μg/L or the hemoglobin is lower than 110 g/L, anemia of pregnant women can be diagnosed (on the finger blood report made in the hospital, you can see the hemoglobin content column, which is lower than the standard value It is anemia, and below 100 is severe anemia).