Embryo multinucleation at the two-cell stage is an independent predictor of intracytoplasmic sperm injection outcomes.

Objective: To determine the prognostic impact of the nuclear status at the two-cell stage on intracytoplasmic sperm injection (ICSI) outcomes.

Design: Retrospective study.

Setting: Hospital.

Clinical success of intrauterine insemination cycles is affected by the sperm preparation time.

Objective: To determine the impact of the time interval from the end of sperm preparation (TSP) to intrauterine insemination (IUI) on the outcome.

Design: Prospective multicentre cohort study.

Setting: Seven French centers (assisted reproduction group in northeastern France, four academic centers, and three clinics).