Achieving a successful IVF pregnancy requires two essential components: a genetically healthy embryo and a receptive uterine lining. Frequently, transfer cycles fail despite using high-grade blastocysts. To resolve this clinical barrier, we often utilizes Endometrial Receptivity Array (ERA). This advanced molecular diagnostic tool maps the exact timeline when your uterus is ready to accept an embryo, maximizing your transfer success. However, evidence shows that ERA is highly controversial for patients with Recurrent Implantation Failure (RIF). While initially designed to identify an individualized “window of implantation”, multiple large-scale studies and systematic reviews have shown that the test does not actually improve pregnancy or live birth.
The endometrium is a dynamic tissue layer that becomes receptive to embryo attachment for only a very brief period during the menstrual cycle. This limited timeframe is medically termed the WOI. In approximately >90% of women, this window occurs at a standard, predictable time. However, remaining populations exhibit displaced timing patterns.
Furthermore, transferring a viable embryo outside of this window leads to implantation failure. An asynchronous timeline prevents the embryo from signalling the uterine wall effectively. Consequently, performing an ERA test allows clinicians to discover your exact genetic timeline before risking precious frozen embryos.
Professor’s Medical Insight: We do not recommend the ERA test as a routine screening for first-time or second time IVF patient. Instead, we save this advanced tool for couples facing Recurrent Implantation Failure (RIF). Identifying a displaced window and doing a personalised embryo transfer as per ERA saves emotional stress and optimizes subsequent frozen cycles.
The ERA procedure mimics an actual Frozen Embryo Transfer (FET) cycle, but without placing a real embryo inside the womb. The entire process follows a strict diagnostic sequence:
| Protocol Stage | Clinical Action & Procedure | Target Objective |
|---|---|---|
| Hormonal Priming | The patient receives structured estrogen and progesterone doses to prepare the uterine lining tissue. | Simulates an exact embryo transfer environment. |
| Endometrial Biopsy | A clinician performs a quick, minor outpatient biopsy exactly 120 hours after starting progesterone. | Harvests a tiny tissue sample safely. |
| Genetic Sequencing | The laboratory analyzes the expression patterns of 248 specific genes within the sample cells. | Determines if the lining is Receptive or Non-Receptive. |
If the final molecular report marks the tissue as Non-Receptive, the system identifies the shift direction. The results will indicate whether the window is pre-receptive or post-receptive. Therefore, our medical team shifts the timing of your progesterone administration forward or backward for your actual transfer.
