With the concept of eugenics deeply rooted in people’s hearts, many female friends will do regular maternity checkups during pregnancy, among which there is a thyroid function screening test during pregnancy checkups, which may make a lot of people have questions or even confused. What is the use of this test? Thyroid disease can involve many organs of the body, clinical hypothyroidism (hypothyroidism) patients with reduced fertility, maternal hypothyroidism during pregnancy may lead to hypertensive disorders in the mother during pregnancy, miscarriage, preterm labor, placental abruption, hypoproteinemia, postpartum hemorrhage, as well as postpartum thyroid function abnormalities of a number of complications; at the same time, hypothyroidism on the fetus also produces abnormalities of the development of the nervous system, in particular, causing Hypothyroidism can also cause neurological abnormalities in the fetus, especially irreversible neurological damage and mental retardation in the offspring. Thyroid disease in pregnancy will significantly increase the maternal and fetal mortality. Therefore, we must pay attention to early screening, early detection and early recognition of thyroid disease in pregnancy. Once abnormal thyroid function in pregnancy is detected, timely and standardized treatment must be carried out, which will significantly reduce the outcome of maternal and fetal adverse maternal history. Who is at high risk for thyroid disease in pregnancy? The first and most common are pregnant women with previous thyroid disease or a history of thyroid disease, surgery, and a family history of thyroid disease, who are susceptible to reoccurring abnormal thyroid function after this pregnancy. The second group is pregnant women who are obese, especially those with a body mass index of more than 40 kg/m2 and those with type 1 diabetes, who should be screened for thyroid function in the early stages of this pregnancy. The third group, which is often overlooked, is pregnant women who have a history of miscarriage or preterm labor, and whose current pregnancy was conceived through reproductive technology, and who should be screened for thyroid function. How do we screen for thyroid function? Thyroid function screening is very simple and easy to perform. There are just three indicators in the blood test that reflect the health of the thyroid gland. One indicator is thyroid stimulating hormone, or TSH as we call it, the second is free thyroxine, and the third is thyroid peroxidase antibodies, which is also a very important indicator. Once abnormalities are detected in these three indicators, the majority of patients can return to normal through timely and effective drug treatment, and the cost of examination and treatment is not high.