J Gynecol Obst Bio R
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Pregnancy has an important impact on thyroid homeostasis. The main hormonal criteria of the thyroid function are modified particularly in case of low iodine supply. ⋯ However, to date, there are no convincing trials assessing the efficacy levothyroxine in subclinical hypothyroidism all the more when TSH levels are between 3 and 4 mU/l. Therefore routine screening for and treatment of subclinical hypothyroidism during pregnancy are unwarranted.