Outcome of in vitro fertilization in women with low response to ovarian stimulation.

The occurrence of low-response (LR) cycles (defined as peak estradiol levels less than 300 pg/ml) in an in vitro fertilization program using a 3 ampule/day human menopausal gonadotropin regimen were retrospectively reviewed. LR occurred in 51 of 564 patients (9%). The LR serum estradiol levels were categorized into four different patterns that were further analyzed for outcome in these initial cycles, as well as for their predictive value of response in subsequent in vitro fertilization cycles. Changing the stimulation protocol to a combination of clomiphene citrate and human menopausal gonadotropin did not improve the ovarian response in this group of LR patients, and their chance to complete a subsequent normal-response treatment cycle was 32%. Suggestions are made to predict outcome and govern management of women with previous LR cycles.