No association between LH levels and ovarian response in oocyte donors triggered with gonadotropin-releasing hormone agonist: A prospective study

Objective Are circulating luteinizing hormone (LH) levels predictive of ovarian response in oocyte donors triggered with gonadotropin-releasing hormone (GnRH) agonists? Study Design A prospective cohort study with 224 oocyte donation cycles between 2021 and 2022 at a single center, examined the relationship between circulating luteinizing hormone (LH) levels and ovarian response. Oocyte donors underwent GnRH antagonist downregulation followed by GnRH agonist trigger. LH, estradiol, and progesterone levels were measured on day one of stimulation, trigger-day and 12 h post-trigger. Oocyte retrieval and maturity rates were analyzed using univariate and multivariate analyses, and the correlation between post-trigger LH levels and outcomes was assessed by Pearson's correlation test. A significance level of p < 0.05 was used. Results Mean age was 26 +/- 4.3 years, mean body mass index (BMI, kg/m2) was 22.6 +/- 3.2 and mean antral follicle count (AFC) was 21.7 +/- 8.2. Post-trigger LH levels averaged 51.3 IU/L (SD 34.8), and oocyte retrieval rate and maturity rates were 112,7% (+/-48,1%) and 77,8% (+/- 17,2%), respectively. No significant differences were found in these outcomes for donors with post-trigger LH values below and above 15 IU/L (Mann Whitney's p > 0.05). However, exploratory analyses revealed that post-trigger LH values < 22 IU/L and basal LH levels < 4 IU/L were associated with significantly lower oocyte retrieval rate (90 % vs 110 %, p = 0.019 and 100 % vs 110 %, p = 0.019, respectively). Conclusions This study, a first in exclusively focusing on oocyte donors, did not support the previously reported LH value of 15 IU/L as predictive of suboptimal ovarian response.