Luteal phase after ovarian hyperstimulation.

The luteal phase was investigated in 17 women with normal menstrual cycles and tubal infertility who were superovulated with clomiphene (9 cycles), clomiphene plus pulsatile human menopausal gonadotrophin (hMG) (12 cycles) and clomiphene plus pulsatile follicle stimulating hormone (FSH) (11 cycles) during an in-vitro fertilization programme. Follicles were aspirated 34-36 h after the onset of the endogenous LH surge. Urinary total oestrogen levels during the first 6 days of the luteal phase were significantly higher, the duration of the luteal phase was significantly shorter and the luteal levels of urinary pregnanediol were significantly lower in the two combination treatment cycles than in the clomiphene only cycles. When the three treatment groups were combined the mid-luteal peak pregnanediol levels and the duration of the luteal phase showed significant negative correlations with plasma or urinary oestrogen levels during the follicular and the luteal phase. It is suggested that the luteal function in cycles superovulated with clomiphene/hMG or clomiphene/FSH is disrupted and this is related to the high amounts of circulating oestrogen.