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What if the IVF missing piece is not only the embryo—but the environment that embryo is trying to implant into? In this powerful episode of The Dr. Brighten Show, Dr. Jolene Brighten sits down with Dr. Gerardo Barroso Villa, a world-renowned fertility expert and reproductive biologist, to talk about recurrent miscarriage, IVF, endometritis, sperm health, PGT-A, and why fertility care should look at the full picture—not just the egg.
Dr. Barroso brings an extraordinary depth of expertise to this conversation. He is introduced as a fertility expert and reproductive biologist trained at prestigious institutions including the Jones Institute for Reproductive Medicine and Cornell University, with advanced expertise in microsurgical male factor treatment and IVF techniques, a doctorate from Eastern Virginia Medical School, more than 2,500 international citations for his research, and experience serving as an ad hoc reviewer for leading medical journals.
Together, Dr. Brighten and Dr. Barroso unpack one of the most emotionally loaded and medically complex topics in reproductive health: why miscarriages happen, what may be missed in recurrent pregnancy loss, and how a more complete fertility workup may help couples make more informed decisions.
The conversation begins with a striking framework from Dr. Barroso: recurrent miscarriage is not always only about the embryo. He explains that he thinks of pregnancy like a box divided into two parts. Part of the equation is the chromosomal or genetic health of the embryo. But the rest, he says, is “the house.” In other words, what is happening in the uterus, the endometrium, the microbiome, the immune environment, and the conditions that allow—or do not allow—an embryo to implant and grow?
That “house” becomes the center of this episode. Dr. Brighten and Dr. Barroso discuss why it may not be enough to say, “Try again,” or to wait for multiple losses before investigating. They talk about the importance of analyzing miscarriage tissue when possible, evaluating the uterus, considering endometrial scarring, looking at thrombophilia-related factors, and asking better questions sooner.
They also dive into chronic endometritis, a topic many women have never heard of until they are deep into fertility struggles. Dr. Barroso explains that the endometrial cavity was once believed to be sterile, but that understanding has changed. He discusses the role of tests like ALICE, which can help identify chronic infection in the uterine cavity, and Dr. Brighten expands on why the endometrial microbiome is very different from the gut microbiome.
The gut microbiome benefits from diversity, but Dr. Brighten explains that the endometrial microbiome should be much less diverse and predominantly lactobacillus species. This matters because, as they discuss, some patients may have genetically tested embryos that look “beautiful,” but implantation still does not happen when the uterine environment is not optimal.
This episode also widens the fertility conversation beyond women. Dr. Barroso emphasizes that sperm health matters, including concentration, motility, morphology, and DNA fragmentation. He discusses how male factor infertility is one of the first things his team considers, and Dr. Brighten explains how ICSI changes the natural sperm-selection process by having the lab choose the sperm that inseminates the egg.
If you have ever been told you have “unexplained infertility,” have experienced pregnancy loss, are considering IVF, or have been told everything comes down to egg quality, this conversation will challenge you to think more broadly. It does not promise a single answer. Instead, it asks a better question: have we gathered enough information to understand what is actually going on?
IVF Missing Piece: What You’ll Learn About Recurrent Miscarriage, Endometritis, and Sperm Health
In this episode, you will learn why the IVF missing piece may be less about one single test and more about how all the fertility variables fit together. Dr. Brighten and Dr. Barroso walk through the clinical questions that often get overlooked when fertility care focuses too narrowly on egg quality alone.
You’ll hear:
- Why Dr. Barroso says recurrent miscarriage is not only about the embryo—and why the “house” may deserve just as much attention.
- The statistic that reframes pregnancy loss: Dr. Barroso explains that about 35% of pregnancy loss may relate to chromosomal or genetic embryo health, while the rest may involve the uterine environment.
- Why waiting for multiple miscarriages before investigating may not make sense to Dr. Barroso—and what he recommends considering even after a first miscarriage.
- How miscarriage tissue analysis may help answer a critical question: was the loss related to chromosomal abnormality, or should the investigation turn toward the uterus?
- Why the uterus may hold answers that routine testing can miss, including scarring in the endometrium or other issues that are not always obvious.
- How thrombophilia-related factors may matter in pregnancy, especially when thinking about risks like prematurity, preeclampsia, and placental disorders.
- Why chronic endometritis may be a major missing piece in recurrent pregnancy loss, even when a patient has no obvious symptoms.
- Why “my vaginal cultures were normal” may not be enough when the real question is what is happening inside the uterine cavity.
- How the ALICE test enters the conversation as a tool Dr. Barroso discusses for looking for chronic infections in the uterine cavity.
- Why the endometrial microbiome is not supposed to look like the gut microbiome. Dr. Brighten explains that while gut diversity is a sign of health, the endometrial microbiome should be much less diverse and around 90% predominantly lactobacillus species.
- Why a “beautiful” genetically tested embryo may still not implant if the uterine environment is not supportive.
- The “seed and soil” fertility framework Dr. Brighten uses to explain why women are both providing the egg and creating the environment for implantation.
- Why sperm health is not optional in fertility conversations, and why Dr. Barroso says the second KPI his team considers is always sperm.
- The sperm statistic that should make every couple pay attention: Dr. Barroso references research looking at sperm from 1920 to 1994 showing a decrease of under 50% in concentration and motility.
- Why fertility care should not only aim for a positive pregnancy test, but for a healthy baby.
- How sperm DNA fragmentation may influence embryo formation, and why looking beyond a basic semen analysis may matter.
- Why ICSI changes the sperm-selection process, with Dr. Brighten explaining that in a natural environment the egg participates in sperm selection, while in ICSI the lab chooses the sperm.
- Why IVF may be both treatment and diagnostic tool, according to Dr. Barroso, because clinicians can observe what happens at each stage of the process.
- Why “unexplained infertility” may sometimes mean not enough has been evaluated, a point Dr. Barroso makes directly when discussing fertility KPIs.
- Why timing matters with ovarian reserve, and why waiting years to escalate treatment may affect the number and quality of eggs available for IVF.
This episode is especially valuable for women and couples who have felt dismissed, rushed, or reduced to a statistic. One of the strongest themes in the conversation is that fertility care should be individualized. Dr. Brighten emphasizes that while research matters, it has to be interpreted in the context of the individual person sitting in front of the clinician.
Why the IVF Missing Piece May Be the Uterine Environment, the Microbiome, and Better Testing
The central message of this episode is that fertility is not a one-variable equation. Dr. Brighten and Dr. Barroso repeatedly return to the idea that success depends on gathering enough information to understand which factors may be relevant for a specific person or couple.
One of the most important shifts in the conversation is moving from “egg quality is everything” to “egg quality is one part of the story.” Dr. Brighten says that many clinicians still reduce fertility to the egg, but she offers a more complete framework: women are both “the seed and the soil.” The egg matters, but so does the soil—the uterine environment, the microbiome, nutrient status, inflammation, and the factors that influence whether a healthy embryo can implant.
Dr. Barroso’s “house” metaphor reinforces the same idea. If an embryo is chromosomally healthy, but the uterus has scarring, chronic infection, microbiome imbalance, or other issues, then the next question should not be “Why did the embryo fail?” It should be “What is going on in the house?”
This is where chronic endometritis becomes a major topic. Dr. Brighten identifies endometritis as a possible contributor to recurrent pregnancy loss, and Dr. Barroso explains that the old belief that the endometrial cavity was sterile is no longer how he thinks about it. He talks about chronic infections and the need for specific testing to evaluate what is happening inside the uterus.
Importantly, they also make a distinction that many patients may not know: testing the vagina is not the same as testing the uterine cavity. Dr. Barroso explains that repeated vaginal examinations may not find what is needed to identify or treat the infection or restore the environment for the embryo.
Dr. Brighten then explains the microbiome difference in a way that is easy to understand. The gut microbiome should be diverse. The endometrial microbiome should not be highly diverse. She explains that it should be about 90% predominantly lactobacillus species. This is a major women’s health takeaway because it helps listeners understand that “microbiome health” means different things depending on where in the body we are looking.
The episode also addresses antibiotics with nuance. Dr. Brighten clarifies that when there is an infection, there is a time and a place for antibiotics. Dr. Barroso agrees and adds that when treating infection, clinicians must also think about lactobacillus and restoring the microbiome.
The example he shares is memorable: a patient had a complicated delivery, a C-section, and an infection after delivery. Two years later, she could not get pregnant, and no one could identify the problem. Dr. Barroso says that when they looked into it, they found a chronic infection in the uterus with no obvious symptoms and no lactobacillus. After treating the infection and supporting the microbiome, he reports that she became pregnant spontaneously two months later.
This is not presented as a guarantee, and it should not be interpreted as one. But it is a powerful illustration of the broader point: symptoms may not always reveal what is happening inside the uterus, and more complete testing may change the direction of care.
The conversation then moves into the concept of KPIs—key performance indicators—in fertility care. Dr. Barroso says his team works through processes and defines KPIs. The first is ovarian reserve, which leads into a discussion of AMH, or anti-Müllerian hormone. He explains that if AMH is decreasing, it may be time to think carefully about pregnancy goals or fertility preservation.
The second KPI is sperm. This is where the episode becomes especially important for couples, because fertility conversations too often center almost entirely on the woman. Dr. Barroso states that one of the first conditions for infertility is male factor. He emphasizes that his team wants to know whether they are working with healthy sperm or whether they need to intervene.
He also makes the point that fertility care has evolved. Years ago, the goal was often simply to get a positive pregnancy test. Now, he says, the goal should be a healthy baby. That shift changes how clinicians think about sperm, embryo development, the placenta, and pregnancy outcomes.
Dr. Barroso discusses how a semen analysis can evaluate concentration, motility, and morphology, but he also talks about evaluating DNA fragmentation to better understand how sperm health may affect embryo formation. He describes tools that can help select sperm, including PICSI, which uses hyaluronic acid to identify more functional sperm before injection through ICSI.
Dr. Brighten adds an important explanation of ICSI for listeners: in the natural environment, the egg participates in choosing the sperm. In the lab, ICSI involves choosing the sperm under a microscope and injecting it into the egg. This distinction helps listeners understand why sperm selection is not a small detail—it is part of the reproductive process being actively managed in the lab.
The final part of the conversation challenges the traditional “stepwise” approach many patients know: try naturally, then try medication, then injections, then insemination, and eventually IVF. Dr. Barroso questions whether this is always the right path, especially when ovarian reserve may decline during years of waiting. He argues that “unexplained infertility” may not always be truly unexplained; sometimes, he says, it means clinicians are not looking correctly.
That does not mean IVF is always the answer. It means the decision should be based on information. Dr. Barroso repeatedly returns to this idea: more information gives patients more power to make decisions.
For anyone navigating recurrent miscarriage, failed implantation, IVF decisions, or male factor infertility, this episode offers a more complete lens. It encourages patients to ask about the embryo, the uterus, the microbiome, the sperm, the ovarian reserve, and whether their care team is looking at the full fertility picture.
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About Dr. Gerardo Barroso Villa
Dr. Gerardo Barroso Villa is introduced in this episode as a world-renowned fertility expert and reproductive biologist. His training includes prestigious institutions such as the Jones Institute for Reproductive Medicine and Cornell University. He has advanced expertise in microsurgical male factor treatment and IVF techniques, a doctorate from Eastern Virginia Medical School, more than 2,500 international citations for his research, and experience serving as an ad hoc reviewer for leading medical journals.
In this episode, he brings a data-driven, process-oriented approach to fertility care, emphasizing that patients need individualized information—not just population statistics—to make decisions about recurrent miscarriage, IVF, sperm health, and embryo transfer.
FAQ: IVF, Recurrent Miscarriage, Endometritis, and Sperm Health
The IVF missing piece discussed in this episode is the idea that fertility care should not focus only on egg quality or embryo genetics. Dr. Brighten and Dr. Barroso discuss the uterine environment, endometrial microbiome, chronic endometritis, sperm health, ovarian reserve, and individualized testing as important parts of the bigger fertility picture.
No. In this conversation, Dr. Barroso explains that chromosomal or genetic embryo health is one part of recurrent miscarriage, but the rest may involve what he calls “the house,” meaning the uterine environment. He encourages looking at both the embryo and the environment.
Dr. Barroso questions the idea that patients must wait for at least two losses before investigating. He discusses analyzing miscarriage tissue when possible to determine whether there was a chromosomal abnormality and, if not, considering what may be happening in the uterus.
Chronic endometritis is discussed in the episode as a chronic infection or inflammatory condition involving the uterine lining. Dr. Brighten identifies it as a possible contributor to recurrent pregnancy loss, and Dr. Barroso discusses the need for specific testing to evaluate the uterine cavity.
According to Dr. Barroso, normal vaginal cultures may not tell the full story. He explains that the uterine cavity needs specific evaluation, because repeated vaginal examinations may not identify the issue affecting the embryo’s environment.
In the episode, Dr. Brighten and Dr. Barroso mention ALICE and EMMA as tests performed through endometrial biopsy. Dr. Barroso discusses ALICE in the context of looking for chronic infections in the uterine cavity, while Dr. Brighten refers to both ALICE and EMMA when discussing the endometrial microbiome.
Dr. Brighten explains that the gut microbiome benefits from diversity, while the endometrial microbiome should have much less diversity. She states that the endometrial microbiome should be about 90% predominantly lactobacillus species.
Dr. Barroso emphasizes that sperm is one of his key fertility KPIs. The episode discusses sperm concentration, motility, morphology, DNA fragmentation, and sperm selection, including how sperm health may affect embryo formation and pregnancy outcomes.
Dr. Barroso explains PGT-A as a test that helps identify chromosomal abnormalities or genetic disease in embryos. In the episode, he frames PGT-A as one piece of information that can support decision-making, not the only factor in fertility success.
Dr. Brighten explains that ICSI is a lab process where a sperm is selected under a microscope and used to inseminate the egg. This differs from the natural environment, where the egg participates in sperm selection.
Dr. Barroso challenges the phrase “unexplained infertility,” saying that sometimes it may be unexplained because the right factors have not been evaluated. He encourages using fertility KPIs and gathering more information to guide decisions.
Dr. Barroso identifies ovarian reserve as one of his first KPIs and discusses AMH as part of that evaluation. He explains that if ovarian reserve is declining, patients may need to think carefully about timing, pregnancy goals, or fertility preservation.
Links Mentioned in This Episode
Dr. Brighten’s article on AMH & Fertility
Dr. Jolene Brighten is a board-certified naturopathic endocrinologist, a Fellow of the American Board of Naturopathic Endocrinology (FABNE), a Menopause Society Certified Practitioner (MSCP), a nutrition scientist, and a certified sex counselor through the Sexual Health Alliance. As a licensed physician maintaining an active DEA license and full prescriptive authority, her educational frameworks align with leading global standards, including ESHRE and The Menopause Society. She serves as a faculty member for the American Academy of Anti-Aging Medicine (A4M), acts as the Lead Researcher for the Brighten Essentials Research Division, and is currently directing ongoing scientific research initiatives to advance clinical care standards for women navigating complex endocrinology, neurodivergence, and tissue-specific hormone sensitivities.
