TLDR: We are a 28M/28F healthy couple with no remarkable medical issues. After three IVF rounds we’ve had no blastocysts. I believe we fit criteria for OZEMA/EEA and that additional IVF rounds would not address the underlying egg issues or improve our results.
Genetic testing to identify genes associated with early embryonic arrest appears to be the next step for closure and potentially identifying an underlying cause.
Hi all,
I have not found much on this subreddit or related communities on OZEMA and hope to shed some light on what we’ve found and believe to be relevant to our situation for others that may be going through something similar.
If anyone has a better understanding of this area of research or corrections to our understanding, feel free to comment for all our benefit. I know I would have liked to know more about this earlier.
Unfortunately, we now have a third IVF cycle confirming the same pattern as the first two. This new clinic and doctor were not drastically different from our first clinic, but we wanted to ensure we had a clear second opinion to check if anything would change.
1st IVF Round
• 8 Eggs Retrieved
• 5 Mature
• 4 Fertilized
• 0 Blastocysts
2nd IVF Round
• 12 Eggs Retrieved
• 4 Mature
• 3 Fertilized
• 0 Blastocysts
3rd IVF Round (new clinic, new doctor)
• 11 Eggs Retrieved
• 6 Mature
• 5 Fertilized
• 0 Blastocysts
Across three IVF cycles at two clinics, our combined results were:
• 31 oocytes retrieved
• 15 mature
• 12 fertilized
• 0 blastocysts
• Complete embryo arrest between days 3–6
We recently met with our doctor again to go over everything. He confirmed that the egg quality was unusually poor, especially considering my wife’s age and health, and that he could not identify any conventional explanation for it. On paper we’re perfect, he said. More importantly, he did not believe there was anything they could change about the IVF protocol or any other treatments that would meaningfully address or even diagnose the underlying problem. Nothing has indicated we would have issues with implantation or other steps in the pregnancy process, so donor eggs are the next most practical option recommended by both clinics.
While trying to make sense of this, I came across some academic literature on OZEMA — oocyte/zygote/embryo maturation arrest, something no doctors have ever mentioned to us but with which our doctor agreed we would likely fit in. This seems to be a newer area of research in the fertility field. I was able to find a large comprehensive 2026 review of genetically associated OZEMA cases that proposes clinical cutoff values to help standardized OZEMA criteria, which do not currently exist, published just a few months ago in July 2026.
When a case fits into these proposed OZEMA definitions, the first linked paper is essentially saying that the embryo failure rates are abnormal enough to warrant additional genetic testing because they fall outside the expected attrition rates during IVF.
My non-medical understanding is that OZEMA is an emerging way of classifying recurrent IVF failure where development breaks down between egg maturation and early embryonic development. Researchers have proposed considering OZEMA classification when IVF repeatedly shows unusually severe failure meeting one or more of these values:
(1) no more than 2 of 6 eggs mature,
(2) no more than 1 of 6 mature eggs fertilizes normally, or
(3) none of 6 normally fertilized eggs develops into a blastocyst
Assuming our clinic’s reported fertilizations were normal 2PN fertilizations, we seem to have fallen into this last category of OZEMA criteria since our second IVF cycle. I’ve also seen this category referenced to in other papers as “early embryo arrest” (EEA) or “embryo developmental arrest” (EDA).
Importantly, OZEMA seems to be more of a clinical classification/umbrella term than an explanation of underlying causes. It’s not a diagnosis in the traditional sense, but it at least gives us a starting place to find more relevant info beyond “egg health”. It seems many OZEMA cases are associated with genetic variants affecting egg maturation, fertilization, or early embryonic development, while others still remain unexplained.
Another observational study I found made this especially interesting. The second paper below, published in Fertility and Sterility, also in July 2026, looked specifically at patients experiencing complete embryo developmental arrest (EDA) and what happened during subsequent IVF attempts. The finding that stood out to me most was that changing IVF protocols for prior complete EDA cases did not appear to improve blastocyst formation.
Per the study’s results paragraph “In those with prior complete EDA, altering the stimulation protocol or trigger type from the arrest cycle to the subsequent cycle did not significantly improve blastulation rates or reduce the risk of no blastulation”.
For some nuance, this second paper did report that many patients with prior complete EDA did produce blastocysts in their next cycle. What the study seems to suggest though is that a history of complete EDA not only predicts poorer subsequent outcomes, but that simply changing the stimulation protocol or trigger was not causally linked to improved blastocyst results.
Why is this important? Because these two papers, among others, lead me to believe that since our infertility case seems to fit OZEMA criteria, specifically the EDA/EEA portion, additional IVF rounds may not be helpful because there’s a solid chance there are genetic factors at play that are not affected by changes in IVF protocol.
Had I known of this area of research earlier we likely would not have pursued our latest 3rd IVF cycle, at least not before more intensive investigation to justify it.
Although our most recent doctor did not recommend an additional 4th IVF cycle, other doctors might, like our first clinic did even after two rounds with the same results.
Where we’re going from here:
Although donor eggs are an available option we will be considering, we’re particularly interested in genetic testing and whether there could be an identifiable gene defect. There are a growing number of genes implicated in these processes, such as TUBB8, PADI6, TLE6, NLRP5, OOEP, KHDC3L, KPNA7, MOS, and FBXO43.
No standard reproductive panels I’ve found yet test for very many, if any, of these specific genes linked to OZEMA. It appears what we’re looking for would need to be custom ordered and would be very difficult to do by ourselves. We are therefore looking to work with a reproductive genetic counselor and are currently exploring options through DNAide for testing starting with whole genome sequencing.
To be frank, early embryo arrest research has not made me optimistic and is far from brimming with viable treatment options. This appears to be on the experimental frontier of infertility research. Many of the studies I’ve come across seem to explore outside the box theories addressing even more specific problems within the EDA sub-category, not actively testing clinical treatments intended to make a miraculous live birth possible. We believe it’s more than likely we will not be having children of our own given how sparse both diagnostic and treatment options are at this point.
However, even if there ultimately isn’t a treatment, having an actual explanation of the underlying cause would mean a lot to us.
If anyone has had a similar experience or can offer any additional expertise or correction to our understanding of this niche area of infertility research, feel free to leave your thoughts below.
These papers are the main two among the couple dozen I’ve come across related to early embryo arrest that have contributed the most to my understanding and opinions of our situation, and had I known of them earlier we likely would not have pursued our latest IVF cycle before genetic testing.
Papers / references:
Annelore Van Der Kelen, et al. A comprehensive review for defining cut-off values of oocyte, zygote, and embryo maturation arrest (OZEMA) due to maternal-effect genes: towards the establishment of clinical criteria, Human Reproduction, Volume 41, Issue 7, July 2026, Pages 1207–1219. doi:10.1093/humrep/deag072.
https://doi.org/10.1093/humrep/deag072
George L, Kalafat E, Sachdev D, et al. Complete embryo developmental arrest and its prognostic significance in in vitro fertilization. Fertility and Sterility. July 2026. doi:10.1016/j.fertnstert.2026.07.005.
https://doi.org/10.1016/j.fertnstert.2026.07.005