Predictive Value of Mid-luteal Serum Progesterone Levels in Egg Donation Cycles

Impact of Serum Progesterone Levels on the Day of Embryo Transfer on the Success Rate in Egg Donation Cycles Under Hormonal Replacement

This study aims to investigate the impact of serum progesterone concentrations on the day of embryo transfer in egg donation cycles under hormonal replacement therapy. As secondary outcomes, the investigators will investigate if endometrial volume measured by three-dimensional (3D) ultrasound on the day of embryo transfer is related with progesterone levels and with chances of pregnancy.

Inclusion Criteria:

• Age<50 yo
• BMI < 30Kg/m2
• Hormonal replacement cycle
• Endometrial thickness >6.5 mm during proliferative phase
• Transfer of one or two blastocyst grade A-B according to ASEBIR

Exclusion Criteria:

• Uterine pathology
• Cryptozoospermia
• Severe implantation failure (>6 GQ embryos transferred without success)