JOURNAL OF SCIENTIFIC & TECHNICAL RESEARCH JUNIPER PUBLISHERS Commentary The normal variations in the levels of maternal Thyroid Hormones (THs) throughout gestation are required for the normal development [1-60], in particular the metabolic homeostasis [60-62]. On the other hand, [63-75] classified the hyperthyroidism into three types as the following: a. Thyrotoxicosis rising from the thyroid. b. Overt hyperthyroidism is found when the concentration of the Thyroid-Stimulating Hormone (TSH) is in the normal range and the concentrations of the 3,5,3'-triiodothyronine (T3) and free or total Thyroxine (T4) are above the normal range. c. Subclinical hyperthyroidism is found when the concentration of the TSH is under the normal range and the concentrations of the T3 and free or total T4 are in the normal range. As well, Glinoer [76] and [77-83] revealed that the Human Chorionic Gonadotropin (HCG) can stimulate the TSH receptor and cause Gestational Tr...
