Introduction. Thyroid hormones play an important role during pregnancy, providing organogenesis, growth and development of the fetus, participate in the formation and development of the brain and its structures, affecting cognitive abilities. Thyroid dysfunction is associated with the pathological course of pregnancy and childbirth, as well as a negative effect on the fetus. Iodine deficiency, which persists throughout Russia, creates the preconditions for the more frequent development of subclinical hypothyroidism and hypothyroxinemia in pregnant women. Therefore, early detection of thyroid dysfunction during gestation in the region of iodine deficiency is relevant.Aim. To assess the thyroid status in pregnant women in the region of iodine deficiency.Materials and methods. A single-center, prospective, one-sample study was performed in a population of pregnant women registered from June 2019 to December 2019 to the antenatal clinic in Tyumen.Results. According to the results of biomedical monitoring of iodine deficiency in the population of pregnant women in Tyumen, iodine supply improved, as evidenced by the median concentration of ioduria 154.4 μg / l, the frequency of endemic goiter was 0.37%. Continuous screening of women in the 1st trimester of pregnancy without thyroid pathology revealed subclinical hypothyroidism in 21.5% of pregnant women, carriage of antibodies to thyroperoxidase was found in 10.5% of women.Conclusions. Given the persisting problem of iodine deficiency, the widespread occurrence of subclinical hypothyroidism in the population of pregnant women, it is necessary to include the study of thyroid status in the standard of examination of pregnant women when registering in an antenatal clinic for early diagnosis and timely treatment of hypothyroidism. It is also recommended to continue preventive measures aimed at replenishing the iodine deficiency starting from the stage of pregravid preparation.