Introduction: Endometrial receptivity: evaluation, induction and inhibition

Area of Science:

• Reproductive biology
• Gynecology
• Embryology

Background:

• Endometrial receptivity is critical for successful embryo implantation.
• The endometrium undergoes cyclical changes, creating a specific 'window of implantation' for optimal embryo attachment.
• The precise timing and duration of this window have been debated since the 1950s.

Discussion:

• The concept of the window of implantation is fundamental to assisted reproductive technologies.
• Hormonal induction of endometrial receptivity is essential for procedures like frozen embryo transfers and third-party reproduction.
• Assisted reproduction relies heavily on understanding and manipulating endometrial receptivity.

Key Insights:

• Not all embryo transfers lead to pregnancy, suggesting a critical receptive period in the endometrium.
• The window of implantation represents a time of peak endometrial receptivity for embryo implantation.
• Exogenous estrogen (E2) and progesterone (P) are used to induce receptive endometrial cycles.

Outlook:

• Further research into the precise molecular mechanisms governing the window of implantation is warranted.
• Optimizing the timing of embryo transfer based on individual endometrial receptivity could improve success rates.
• Advanced diagnostics may refine the assessment and synchronization of the window of implantation in clinical practice.