Thyroid stimulating hormone 0.48uIU/ml in pregnant women is generally normal. Due to different examination methods and reagents, the reference indexes of each hospital are different and need to be analyzed specifically. The normal range of thyroid stimulating hormone in pregnant women is divided into three periods. Early pregnancy is between 0.1 and 2.5 uIU/ml, the normal range in mid-pregnancy should be between 0.2 and 3.0 uIU/ml, and late pregnancy should be between 0.3 and 3.0 uIU/ml. After pregnancy, thyroid function needs to be checked because abnormal thyroid function may lead to miscarriage, abnormal fetal development, and may also affect fetal intelligence. Because thyroid stimulating hormone regulates the synthesis and secretion of thyroid hormone, which affects the normal growth and development of the fetus, especially the development of the fetus’s brain, the thyroid stimulating hormone of pregnant women needs to be maintained within the normal range. Patients with abnormal thyroid stimulating hormone levels during pregnancy should be seen by a doctor.