Thyroid function test is a routine test during pregnancy, and hospitals usually recommend pregnant women to take the test in early pregnancy. It is the most basic thyroid function test, including TSH, FT3 and FT4, and it is generally recommended that pregnant women check their thyroid function in early pregnancy, and if there is any abnormality in the thyroid function, they need to be diagnosed and treated in time in order to avoid any impact on the development of the fetus. Pregnant women with thyroid function problems are prone to preterm labor, miscarriage, deformed babies, abnormal brain development, growth retardation and other risks, so it is recommended to check thyroid function during pregnancy. If there is an abnormality in nail function before pregnancy, it is generally recommended to have a regular diagnosis and treatment before getting pregnant; if an abnormality in nail function is detected during the maternity checkup during pregnancy, it is necessary to clarify whether to continue the pregnancy or to treat it according to the doctor’s advice. Pregnant women with abnormal thyroid function can usually return to normal after taking medication regularly. Timely detection and treatment can effectively minimize the impact on the development of the fetus, and pregnant women need to review their thyroid function on a regular basis and pay close attention to the changes in thyroid function.