Dating the endometrial biopsy.

Nanette Santoro, Laura T. To examine the relationship between endometrial histological maturation and reproductive hormones, we studied 11 fertile women, aged 18—37 yr. All participants had had at least 1 previous pregnancy and cycled regularly, every 25—35 days.

s when endometrial ‘ dating ‘ was established based on dating criteria have evolved, including the use Noyes RW, Hertig AI, Rock J. Dating the.

Patients and Methods: A novel method was used for endometrial dating , with parameters including menstrual cycle days, Noyes histological criteria, along with immunohistochemical expression pattern of estrogen and progesterone receptors and proliferation marker Ki Results: Endometrial maturation varied individually, occurring 1. Comparison of histological maturation with clinical days after ovulation showed a delay of about 2 days.

Conclusion: Endometrial maturation requires 8 days, rather than the expected 6 days, to reach the histological mid-secretory phase. This is not a delay and is also seen in fertile patients. The new analysis method used is superior to that using Noyes criteria alone and provides a better basis for determining conditions for optimal timing of embryo transfers. The endometrium is one of the major factors involved in embryo implantation. However, the process involved and the underlying molecular mechanisms that enable the endometrium to enter the receptive phase are still not fully clear.