The indicator of anemia in pregnant women is a peripheral blood hemoglobin of less than 110 g/L in pregnant women. Indicators of anemia in pregnant women are classified according to the specific value of hemoglobin. As the blood volume increases with the growth of pregnancy, the red blood cell density dilutes and the concentration of hemoglobin decreases, and a peripheral blood hemoglobin value of less than 110g/L is considered anemia. Anemia in pregnancy is more common in iron deficiency anemia and less common in aplastic anemia, and treatment varies according to the cause and severity of the anemia. Anemia in pregnant women can be further classified according to hemoglobin level as mild anemia (100-109g/L), moderate anemia (70-99g/L), severe anemia (40-69g/L), and very severe anemia (<40g/L). If the blood routine during pregnancy suggests anemia, it is necessary to consult the doctor in time to clarify the cause of anemia and treat the symptoms.