- No clinically significant abnormalities in serum thyroid stimulating hormone (TSH), dehydroepiandrosterone (DHEA-S), prolactin, and FSH levels in the early follicular phase. Subjects low TSH level who receive replacement therapy could be enrolled at the discretion of the investigator if local laboratory results (thyroxine [T4]) demonstrated satisfactory thyroid function. Subjects receiving stable dose of dopamine agonists could be enrolled at the discretion of the investigator if local laboratory results demonstrated adequate control of prolactin levels