Personalized, Evidence-Based Assessment
Few moments in fertility care are as difficult as a failed embryo transfer — particularly when the embryo was graded as high quality or confirmed euploid through preimplantation genetic testing. The question that follows is almost always the same: what went wrong, and what should we do differently next time?
The honest answer is that implantation is one of the most intricate processes in reproductive medicine. It depends on the simultaneous cooperation of a competent embryo, a properly prepared endometrium, a healthy uterine cavity, and a balanced local immune and microbiologic environment. When any one of these elements is out of alignment, an otherwise promising transfer may not result in pregnancy.
It is important to keep this in perspective. Even with excellent embryos, implantation does not always occur on the first or second attempt, and true recurrent implantation failure — defined rigorously in the literature — is relatively uncommon. For most patients, a careful review of embryo quality, transfer timing, and uterine preparation is sufficient. For a selected group of patients, however, particularly those who have experienced multiple failed transfers of good-quality or euploid embryos, a more comprehensive evaluation of the uterine environment can reveal actionable findings that change the outcome of the next cycle.
At Fertility Center & Applied Genetics of Florida, we offer a structured and expanded evaluation designed to assess endometrial timing, inflammation, microbiome balance, and uterine anatomy before proceeding with another embryo transfer. The goal is not to layer on intervention for its own sake, but to understand each patient’s physiology well enough to make the next transfer as informed as possible.
Mock (Practice) Endometrial Preparation Cycle
The evaluation begins with a mock (practice) hormone replacement cycle. This is not a transfer cycle. Instead, it is designed to replicate the exact hormonal protocol that would be used for your next frozen embryo transfer, without placing an embryo at risk.
This approach allows us to:
- Precisely control estrogen and progesterone exposure under conditions identical to a real transfer cycle
- Perform targeted endometrial biopsies at the expected window of implantation
- Individualize the timing of your next transfer based on what your endometrium actually does, not what it is assumed to do
Successful implantation requires tight synchronization between the developing embryo and the receptive endometrium during a narrow window of implantation. In a subset of patients with prior transfer failures, studies suggest this window may be displaced — opening earlier or later than the standard protocol assumes. A mock cycle gives us a safe opportunity to study this timing before an embryo is committed to the transfer.
Igenomix TRIO Endometrial Biopsy
During the mock cycle, we perform the Igenomix TRIO test, a single biopsy that evaluates three clinically meaningful components of the endometrial environment.
A. Window of Implantation (ERA)
The Endometrial Receptivity Analysis (ERA) component characterizes the endometrium at the time of biopsy as:
- Receptive – the window aligns with standard protocol timing
- Pre-receptive – more progesterone exposure is needed before transfer
- Post-receptive – less progesterone exposure is needed; the window opens earlier
If the result indicates a displaced window, we adjust the duration of progesterone exposure in your next transfer cycle so that embryo placement is precisely aligned with your personalized implantation window.
B. Endometrial Microbiome (EMMA)
The EMMA component evaluates the bacterial environment of the uterus, with particular attention to the presence and dominance of Lactobacillus species. A Lactobacillus-dominant uterine microbiome is associated with a healthier environment for implantation, and imbalances may be addressable before the next transfer.
C. Chronic Endometritis Screening (ALICE)
The ALICE component screens specifically for pathogenic bacteria associated with chronic endometrial inflammation — a condition that is often clinically silent but may meaningfully affect receptivity. When identified, chronic endometritis is typically treatable with targeted antibiotic therapy before proceeding with another transfer.
It is important to be candid: endometrial receptivity testing remains an evolving area of reproductive medicine, and the evidence base continues to mature. We do not recommend it for every patient. In carefully selected patients with prior implantation failure, however, the information it provides can meaningfully inform the next cycle.
ReceptivaDx Biopsy
In the same mock cycle, we may also perform a ReceptivaDx biopsy, which evaluates different but complementary markers of the uterine environment.
The test looks for:
- BCL6 overexpression, a marker associated with progesterone resistance and often linked to occult endometriosis or inflammatory processes such as hydrosalpinges
- Inflammatory markers and mast cell activation, which may suggest a broader inflammatory uterine environment
Elevated BCL6 expression has been associated with decreased implantation and may guide treatment decisions before the next transfer. This matters because endometriosis-related inflammation can be present without the classic symptoms many patients associate with the condition. A patient may have no significant pain, no visible lesions on imaging, and still carry an inflammatory signature that compromises receptivity.
When abnormal findings are identified, treatment may include:
- Medical suppression — such as GnRH agonist or antagonist therapy to quiet the inflammatory process before transfer
- Surgical evaluation and treatment — for endometriosis or hydrosalpinges, when anatomy or symptoms warrant it
- Targeted anti-inflammatory management — tailored to the specific findings
The aim is to address the underlying environment rather than simply repeating the same transfer protocol and hoping for a different result.
Diagnostic Hysteroscopy
Before another embryo transfer, we often recommend office diagnostic hysteroscopy — a direct, visual evaluation of the uterine cavity using a thin camera passed through the cervix. It is typically well tolerated, performed in the office, and offers a level of detail that ultrasound alone cannot.
Hysteroscopy allows us to identify and, where appropriate, treat:
- Polyps
- Subtle intrauterine adhesions
- Chronic inflammatory changes
- Small fibroids distorting the cavity
- Inflammation visible on the endometrial surface
- Adenomyosis pits or pockets
Even when ultrasound imaging appears normal, hysteroscopy can occasionally detect subtle findings that may interfere with implantation. Direct evaluation of the uterine cavity is a well-established component of implantation assessment, and for patients with unexplained failed transfers, it often provides either reassurance or a small but meaningful correction.
Platelet-Rich Plasma (PRP)
For a selected group of patients — particularly those with persistently thin endometrium or repeated failed transfers despite otherwise normal findings — we may recommend intrauterine platelet-rich plasma (PRP) infusion before transfer.
PRP is prepared from the patient’s own blood and contains concentrated growth factors that may enhance endometrial development and improve receptivity. Recent evidence syntheses suggest PRP shows potential benefit in recurrent implantation failure, though study quality varies and further high-quality trials are ongoing.
We use PRP selectively and in the appropriate clinical context. It is not a routine intervention, and we are careful to distinguish between what is promising and what is proven.
Our Philosophy
Implantation requires the convergence of several conditions:
- A competent embryo
- A receptive and synchronized endometrium
- A healthy uterine cavity
- Balanced local immune and microbiologic conditions
When prior transfers have not resulted in pregnancy, our goal is not to add unnecessary intervention but rather to perform a thorough evaluation that identifies actionable findings before proceeding again. Every test we offer in this expanded evaluation has a specific question it is designed to answer. If the question does not apply to your case, the test does not belong in your plan.
This is the same principle that has guided our PGT and IVF programs since 1999: use advanced technology when it changes decisions, and respect the patient enough to be honest about what it can and cannot tell us.
Moving Forward
If you have experienced multiple failed embryo transfers, we will sit down with you and review:
- Embryo quality and genetic status
- Prior transfer protocols and timing
- Endometrial thickness and pattern across past cycles
- Uterine cavity imaging
- Whether an expanded endometrial evaluation is appropriate in your specific case
Every patient is different, and no single protocol fits everyone. Our approach is individualized, thoughtful, and grounded in current reproductive science — not in reflexive repetition of the same cycle.
If you would like to discuss whether this expanded evaluation is appropriate for you, our team is here to help.
References
- Rate of true recurrent implantation failure is low: results of three successive frozen euploid single embryo transfers. Fertility and Sterility, 2021.
- Endometrial receptivity testing for assisted reproductive technologies. The Cochrane Database of Systematic Reviews, 2025.
- Introduction: endometrial receptivity: evaluation, induction and inhibition. Fertility and Sterility, 2019.
- Histological endometrial dating: a reliable tool for personalized frozen-thawed embryo transfer in patients with repeated implantation failure in natural cycles. BMC Pregnancy and Childbirth, 2023.
- Clinical value of histologic endometrial dating for personalized frozen-thawed embryo transfer in patients with repeated implantation failure in natural cycles. BMC Pregnancy and Childbirth, 2020.
- Interventions for recurrent embryo implantation failure: an umbrella review. International Journal of Gynaecology and Obstetrics.
Fertility Center & Applied Genetics of Florida
Sarasota: 5100 Station Way, Sarasota, FL 34233 | (941) 342-1568
Bonita Springs: 9420 Fountain Medical Court, Suite 100, Bonita Springs, FL 34135 | (239) 333-2229
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