Timing therapeutic donor inseminations in natural cycles: human chorionic gonadotrophin administration versus urinary LH monitoring.

This cohort study assessed whether timing therapeutic donor sperm inseminations (TDI) in natural cycles (NC) using ultrasound monitoring and ovulation trigger with human chorionic gonadotrophin (US/HCG) improves cumulative live birth rates (LBR) compared with detection of LH surge with urinary kits (u-LH). It included 232 normo-ovulatory women aged ≤40 years, undergoing 538 TDI in NC between 2011 and 2014. In the u-LH group (113 women, 267 cycles), TDI was performed the day following a positive test. In the US/HCG group (119 women, 271 cycles), ovulation was triggered with HCG when a follicle ≥17 mm was noted, and TDI performed 36 h later. The first three cycles were analysed per patient. Groups were comparable for baseline characteristics. Cumulative LBR were comparable between u-LH and US/HCG groups (31.47% versus 23.11%, respectively) (log-rank test). A generalized estimating equation analysis was performed to compare outcomes per cycle. The LBR per started cycle was comparable between the u-LH and US/HCG groups (12.4% versus 9.2%, respectively). Cancellation rate was significantly higher with u-LH (19.1% versus 11.4%, P = 0.011), but did not impact overall outcomes. In conclusion, urinary LH monitoring is as effective as ultrasound monitoring and ovulation trigger with HCG in TDI performed in NC.