IVF failure can occur due to multiple factors, most commonly related to embryo quality, uterine conditions, or chromosomal abnormalities. Identifying the exact cause is essential, as different factors require different treatment approaches. A personalized evaluation and targeted strategy may help improve the chances of success in future IVF cycles.
This article is based on insights from the original webinar: “Understanding and overcoming IVF failure: causes, strategies, and new insights”
Summary
- Embryo-related factors are the most significant contributors to IVF failure
- Chromosomal abnormalities are a common cause of implantation failure
- Uterine issues (fibroids, polyps, endometritis) can reduce implantation success
- Immune and clotting disorders may also play a role
- Egg and sperm quality both influence outcomes
- Genetic testing (PGT-A) may help select embryos with higher implantation potential
- Endometrial testing can personalize embryo transfer timing
- Advanced technologies, including AI, may support embryo selection
- Egg donation may be considered in cases of poor egg quality or repeated failure
- Treatment should always be individualized based on patient-specific factors
Why Does IVF Fail?
IVF failure is rarely caused by a single issue. Instead, it often results from a combination of factors involving:
- The embryo
- The uterus and endometrium
- Genetic and chromosomal factors
- The immune or clotting system
- Male factor infertility
Among these, embryo-related factors may account for around 70% of implantation failures, making them the most critical area to evaluate.
IVF Failure – Factors Related to the Embryo
Embryo Quality and Morphology
Embryo quality is one of the most important determinants of IVF success.
- High-quality embryos may have a higher implantation potential
- Lower-quality embryos may have reduced implantation rates
Embryo classification provides insight into expected outcomes, but good morphology does not guarantee a genetically normal embryo.
Chromosomal Abnormalities
Chromosomal abnormalities are a major cause of implantation failure.
- Even good-quality embryos may carry chromosomal issues
- These abnormalities can prevent implantation or lead to miscarriage
Role of Genetic Testing
Preimplantation genetic testing (PGT-A) may be considered in cases such as:
- Repeated implantation failure
- Recurrent miscarriage
- Known parental genetic abnormalities
- Advanced maternal age
PGT-A aims to reduce the likelihood of transferring embryos that are not chromosomally normal.
Egg Quality and Implantation Failure
Egg quality plays a central role in embryo development and implantation.
Factors Affecting Egg Quality
- Age
- Ovarian reserve
- Previous response to stimulation
Strategies That May Be Considered
- Supplements such as:
- Melatonin
- Inositol
- CoQ10 (ubiquinol)
- Adjusting stimulation protocols
- Using dual stimulation (two stimulation phases within one cycle)
These approaches may help improve outcomes in some patients, although their impact can vary.
Embryo Transfer Strategies
Timing and Stage of Transfer
- Blastocyst transfer (day 5) is commonly used
- It allows better embryo selection and timing
Single vs Multiple Embryo Transfer
- Single embryo transfer is often preferred
- It reduces risks such as:
- Prematurity
- Preeclampsia
- Gestational diabetes
In some cases, transferring two embryos may be considered, depending on patient-specific factors and risks.
Time-Lapse Technology
Time-lapse incubators:
- Keep embryos in stable conditions
- Capture images frequently
- Provide detailed developmental information
This may help embryologists select embryos with higher potential.
Uterine and Endometrial Factors
Structural Abnormalities
Conditions that may affect implantation include:
- Fibroids
- Polyps
- Adhesions
- Uterine malformations
These can often be identified through imaging or hysteroscopy and treated before transfer.
Endometrial Health
Chronic Endometritis
- A chronic infection of the uterine lining
- May contribute to implantation failure or miscarriage
Microbiome Imbalance
- The balance of bacteria in the uterus may influence outcomes
Testing (such as ES-META) can help assess these factors.
Window of Implantation
The window of implantation is when the endometrium is most receptive.
- Tests like ES-TIME (ERA equivalent) may help identify this timing
- These tests are not suitable for all patients
- Their use may be considered in selected cases
Assessing the Uterus
3D Ultrasound
Used to evaluate:
- Uterine shape and size
- Structural abnormalities
- Conditions such as adenomyosis
Hysteroscopy
Allows:
- Direct visualization of the uterine cavity
- Removal of polyps or fibroids
- Tissue sampling if needed
Clotting and Immune Factors
Thrombophilia and Antiphospholipid Syndrome
- May reduce implantation rates
- May increase pregnancy complications
Treatment may include:
- Heparin
- Aspirin
- Combination therapy
Immune System Evaluation
In some cases:
- Immune testing may be performed
- Treatments may include corticosteroids or intralipids
The goal is to maintain an optimal immune balance for implantation.
Male Factor and Sperm Quality
Male factors can contribute to IVF failure.
Advanced Testing
Beyond standard semen analysis:
- DNA fragmentation tests (e.g., SpermComet) may be used
Sperm Selection Techniques
If abnormalities are found:
- Specialized selection methods may be applied
- Aim: reduce the risk of using damaged sperm
Indications for Egg Donation
Egg donation may be considered in cases such as:
- Low ovarian reserve
- Poor egg quality
- Advanced maternal age
- Repeated IVF failure
- Genetic concerns
There is no fixed number of cycles after which egg donation must be chosen. The decision depends on:
- Patient preference
- Clinical prognosis
- Emotional and personal limits
Artificial Intelligence in IVF
AI is increasingly used in embryo selection.
Examples of Applications
- Scoring embryo quality
- Analyzing developmental patterns
- Evaluating endometrial conditions
These tools support decision-making but do not replace clinical judgment.
Strategies to Improve IVF Success
A comprehensive approach may include:
- Detailed evaluation of embryo quality
- Genetic testing when appropriate
- Uterine assessment and treatment
- Endometrial testing in selected cases
- Optimization of stimulation protocols
- Addressing sperm DNA fragmentation
- Considering advanced technologies
Most importantly, treatment should be personalized.
Conclusion
IVF failure is multifactorial and requires a structured, individualized approach.
Key priorities include:
- Identifying the underlying cause
- Selecting appropriate diagnostic tools
- Applying targeted treatment strategies
- Using available technologies where appropriate
A multidisciplinary team and personalized care plan may help improve outcomes in subsequent cycles.
FAQ: Understanding IVF Failure
Do you consider adenomyosis a significant factor affecting implantation?
Adenomyosis can be a significant factor depending on its type. Some forms may interfere with the uterine lining and affect implantation. Treatment often involves temporarily reducing hormone levels for a few months to minimize its impact.
What supplements may support egg quality?
Supplements such as melatonin, inositol, and CoQ10 (ubiquinol) are sometimes used. While their exact impact is uncertain, they may be considered in some cases.
How long is the ERA test valid?
The ERA test is generally considered valid for about two years. However, events such as pregnancy or uterine surgery may affect its reliability.
What is the difference between ERA, ES Time, and ES Meta?
- ERA and ES Time refer to the same type of test (implantation timing)
- ES Meta is equivalent to microbiome and endometritis testing (similar to EMMA/ALICE)
When should egg donation be considered?
There is no fixed rule. The decision depends on factors such as age, egg quality, previous IVF attempts, and personal preference.
Does PGT-A reduce implantation success?
PGT-A is an invasive technique, but it is designed to improve implantation chances by selecting embryos with higher potential. Embryos are usually frozen after biopsy before transfer.
Should immune status be rechecked after failed cycles?
It may be considered, especially if time has passed or if there have been miscarriages or repeated implantation failures.
How can uterine contractions be reduced during transfer?
A gentle embryo transfer technique is essential. Progesterone is commonly used, while other medications have not consistently shown effectiveness.
