If a pregnant woman has low hemoglobin during pregnancy, it indicates anemia. This condition may be due to an unreasonable diet structure and nutritional deficiency during pregnancy, most of which may be caused by iron deficiency; in addition, it is also related to the increase in blood volume and blood thinning after pregnancy. Anemia can have an impact on the development of the baby and is also detrimental to the delivery of the pregnant woman. Therefore, pregnant women with low hemoglobin need to take appropriate medication to correct the anemia. For such pregnant women, it is also recommended to undergo a genetic diagnostic test for thalassemia to rule out thalassemia.