Does the endometrial receptivity array really provide personalized embryo transfer?

Area of Science:

• Reproductive Endocrinology
• In Vitro Fertilization (IVF)

Background:

• Endometrial receptivity is crucial for successful embryo implantation.
• The endometrial receptivity array (ERA) test aims to personalize embryo transfer timing.
• The effectiveness of ERA in improving pregnancy rates in good prognosis patients requires further investigation.

Purpose of the Study:

• To determine the prevalence of non-receptive endometrium using the ERA test in infertile patients.
• To evaluate if adjusting embryo transfer day based on ERA results enhances pregnancy rates compared to standard protocols.

Main Methods:

• A retrospective cohort study compared 53 patients undergoing ERA testing with 503 control patients.
• Patients in the study group had an endometrial biopsy during a mock cycle for ERA testing and histological assessment.
• Frozen embryo transfer (FET) timing was adjusted based on ERA results for the study group.

Main Results:

• No significant difference in ongoing pregnancy rates was observed between the ERA-tested group (39%) and the control group (35.2%).
• ERA testing identified a high percentage of patients with non-receptive endometria (9.4% post-receptive, 54.7% pre-receptive).
• Pregnancy rates were comparable between ERA-adjusted transfers for non-receptive cases (33.3%) and the control group's background rate (35.2%).

Conclusions:

• ERA testing in a mock cycle does not appear to improve ongoing pregnancy rates in good prognosis IVF patients.
• Further large-scale prospective studies are necessary to clarify the role of ERA testing.
• The utility of ERA in patients with recurrent implantation failure warrants additional research.