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  • Title: Daily blood hormone levels related to the luteinizing hormone surge in anovulatory cycles.
    Author: Wu CH, Cowchock FS.
    Journal: Fertil Steril; 1983 Jan; 39(1):39-43. PubMed ID: 6401251.
    Abstract:
    We have evaluated daily blood levels of gonadal steroids and trophic hormones in the cycles of four ovulatory and six anovulatory patients with a luteinizing hormone (LH) surge. The cycles of anovulatory nonhirsute patients were characterized by a premature and blunted LH surge and by low levels of follicle-stimulating hormone (FSH) throughout the study period in the face of normal tonic and peak levels of estrone and estradiol (E2). These observations, together with decreased levels of prolactin, suggest a hypothalamic pituitary abnormality as the cause of anovulation in these patients. The cycles of anovulatory hirsute patients were marked by a decrease in E2 production and a blunted and delayed E2 peak. Androgen levels were elevated throughout the cycle and may have a direct inhibitory effect on ovarian folliculogenesis. The LH/FSH ratio in the follicular phase was high in both groups of anovulatory patients when compared with ovulatory controls; however, the shifts in gonadotropin levels producing the increase in this ratio were different for these two groups.
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