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Variation in serum levels of thyroid function test and pregnancy-related hormones according to course of gestation. TBG, thyroxine-binding globulin; T4, thyroxine; T3, triiodothyronine; hCG, human chorionic gonadotropin; TSH, thyroid-stimulating hormone. (Adapted from Glinoer8 and Brent,9 with permission.)
