Blood routine is a very common test that needs to be reviewed at all stages of pregnancy. Blood routine in pregnancy mainly depends on several aspects: first, look at the hemoglobin, because the blood volume of pregnant women increases after pregnancy, blood dilution, prone to anemia, if the hemoglobin is below 110g consider having anemia. For pregnant women with anemia need to actively replenish blood treatment, in addition to replenish hemoglobin, but also check thalassemia, to exclude thalassemia. Second, look at the platelets, the blood of pregnant women during pregnancy belongs to the high state, under normal circumstances the platelet value is normal or high, if the platelet count is below 100g belongs to thrombocytopenia, it will increase the risk of bleeding. Third, look at the white blood cells and neutrophils, these two indicators, if abnormal, suggest the presence of infection.