Plasma gonadotropin and sex steroid hormone levels during early, midfollicular, and midluteal phases of women with luteal phase defects.

Thirteen women with luteal phase defects (LPD) confirmed by endometrial biopsies and 14 with histologically normal endometria were studied for early follicular and midfollicular phase follicle-stimulating hormone (FSH) and luteinizing hormone (LH) levels and for midluteal phase progesterone, estrogen, testosterone, and prolactin levels. The results showed that the women with LPD had significantly lower FSH levels and FSH/LH ratios in the early and midfollicular phases. LH levels, however, were similar in the LPD and normal women. During the midluteal phase, the LPD women showed significantly lower levels of progesterone and estrogen and normal levels of testosterone and prolactin. These findings reaffirm the prevailing concept that events surrounding follicular growth and development can indeed influence the quality of that cycle's corpus luteum. Furthermore, LPD as a result of hyperprolactinemia appears to be a different entity from that due to inadequate follicular phase FSH.