Incomplete androgen and progesterone suppression following midluteal GnRHa prior to controlled ovarian hyperstimulation for IVF-ET.

PURPOSE: We aimed to determine if midluteal GnRH agonist (GnRHa) use prior to controlled ovarian hyperstimulation (COH) results in uniform progesterone and androgen suppression and whether elevations of these hormones occurring early in follicular development may adversely effect the outcome of IVF-ET.

METHODS: Forty-four COH cycles using midluteal GnRHa were evaluated. Serum gonadotropins (LH and FSH) and gonadal steroids (E2, A, P4, and T) were measured after 10 days of GnRHa administration [cycle day 31 (CD 31)] and again on the day of hCG administration, following COH. Cycle outcomes evaluated were the number of oocytes retrieved, morphologic grade, fertilization, implantation, pregnancy, and spontaneous abortion rates.

RESULTS: Endogenous serum FSH was uniformly suppressed (6.32 +/- 0.47 IU/L) on CD 31, however, LH was not (23.76 +/- 0.76 IU/L). Five and four tenths percent of cycles demonstrated low-level P4 elevations (> or = 0.9 ng/ml), 24.4% demonstrated serum androstenedione levels > or = 600 pg/ml, and 39% of cycles were characterized by serum T levels > or = 200 pg/ml despite evidence of E2 suppression (< or = 30 pg/ml) and the absence of follicular growth by sonography. LH levels were not predictive of incomplete P4 or androgen suppression. Elevations of either P4, A, or T occurring early in the follicular phase were not found to correlate with an impairment in clinical cycle outcome.

CONCLUSIONS: Midluteal GnRHa use prior to COH may result in incomplete suppression of circulating progresterone and androgens. However, these relative elevations, occurring early in the development of the follicular cohort, did not appear to affect IVF cycle outcome adversely.