Introduction
Repeated IVF failure can be emotionally and financially exhausting. After one unsuccessful cycle, couples often wonder what went wrong. After two or more failures, an important question may arise: Could genetics be playing a role?
Sometimes, the answer can involve chromosome abnormalities in embryos or, less commonly, a chromosome rearrangement in one of the parents. This is where preimplantation genetic testing (PGT) may enter the discussion.
However, PGT is not a magic solution for IVF failure. It is a tool that may help doctors understand or reduce certain genetic risks in carefully selected situations. The right approach depends on age, embryo history, previous IVF outcomes, family history, and whether a genetic or chromosomal problem has already been identified.
If you have experienced repeated IVF failure, discussing your history with a fertility specialist and, when appropriate, a genetic counselor can help you decide whether PGT makes sense for you.
Table of Contents
| Sr# | Headings |
|---|---|
| 1 | What Is Recurrent IVF Failure? |
| 2 | Can Genetics Cause IVF Failure? |
| 3 | How Embryo Chromosome Abnormalities Affect IVF |
| 4 | What Is PGT? |
| 5 | Different Types of PGT |
| 6 | When Should Couples Consider PGT-A? |
| 7 | When Is PGT-SR More Appropriate? |
| 8 | When Should Couples Consider PGT-M? |
| 9 | Should Both Partners Have Genetic Testing? |
| 10 | What Happens During PGT? |
| 11 | Benefits and Limitations of PGT |
| 12 | PGT After Repeated IVF Failure: What Should You Ask? |
| 13 | Choosing the Best IVF Doctor in New Delhi |
| 14 | Final Thoughts |
| 15 | Frequently Asked Questions |
1. What Is Recurrent IVF Failure?
There is no single universally accepted definition of recurrent implantation failure. A failed IVF cycle can happen for many reasons, including embryo-related factors, uterine conditions, hormonal problems, sperm-related factors, and chance.
The American Society for Reproductive Medicine (ASRM) notes that recurrent implantation failure should be evaluated in context rather than simply being defined by an arbitrary number of failed transfers. A detailed review of the patient’s reproductive history and previous IVF cycles is important before ordering extensive investigations.
This distinction matters because not every failed IVF cycle means that something is genetically wrong.
An embryo may fail to implant even when there is no identifiable medical problem. Think of implantation like planting a seed: the seed, soil, moisture, timing, and many other conditions all matter. Genetics is only one piece of that puzzle.
2. Can Genetics Cause IVF Failure?
Yes, genetic and chromosomal factors can contribute to unsuccessful IVF treatment.
One of the most important genetic factors is embryo aneuploidy, meaning that an embryo has an abnormal number of chromosomes. Embryos with significant chromosome abnormalities often have a reduced ability to implant and develop into an ongoing pregnancy.
The likelihood of embryo chromosome abnormalities generally increases with maternal age. ASRM’s 2026 guidance identifies age-related embryo aneuploidy as an important contributor to implantation failure.
There is another possibility: one partner may carry a balanced chromosome rearrangement, such as a translocation. A person carrying such a rearrangement may be healthy, but some eggs or sperm can contain an unbalanced chromosome arrangement. This can result in embryos with chromosome abnormalities.
In these situations, genetic counseling and specialized PGT may be considered.
3. How Embryo Chromosome Abnormalities Affect IVF
Human embryos normally receive chromosomes from both parents. When an embryo receives an extra chromosome or is missing one, it is described as aneuploid.
Some chromosome abnormalities can prevent an embryo from implanting. Others may lead to an early miscarriage, while certain abnormalities can result in a pregnancy affected by a chromosome condition.
This is one reason embryo genetics has attracted significant attention in modern IVF.
But there is an important point to remember: an embryo that looks excellent under a microscope is not necessarily chromosomally normal.
Embryo grading evaluates characteristics such as appearance and development. Genetic testing looks at a different question: whether the embryo shows particular chromosome or genetic abnormalities.
That does not mean genetic testing should automatically be performed on every embryo. Current evidence does not support routine PGT-A for every person undergoing IVF. ASRM’s 2024 committee opinion states that the value of PGT-A as a universal screening test has not been established.
4. What Is PGT?
Preimplantation genetic testing (PGT) refers to genetic testing performed on embryos created through IVF before an embryo is transferred to the uterus.
At the blastocyst stage, a small number of cells are typically removed from the outer layer of the embryo for testing. The embryo may then be frozen while the laboratory analyzes the sample.
PGT is not one single test. Different forms are designed for different genetic questions.
The three commonly discussed categories are:
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PGT-A: Tests for chromosome number abnormalities.
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PGT-SR: Tests embryos when a parent has a known structural chromosome rearrangement.
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PGT-M: Tests for a specific inherited single-gene condition.
The American College of Obstetricians and Gynecologists (ACOG) explains that PGT can assess embryos for specific genetic disorders or chromosome abnormalities, but testing has limitations and cannot guarantee that a baby will be free of every genetic condition.
5. Different Types of PGT
PGT-A: Testing for Chromosome Number
PGT-A examines embryos for abnormalities involving chromosome number.
It may be discussed particularly when there are concerns about embryo aneuploidy. Maternal age, embryo availability, previous reproductive history, and the overall treatment plan can influence the decision.
However, PGT-A should not be presented as a guaranteed way to increase the chance of a live birth after IVF. Current evidence is mixed, and ASRM states that PGT-A has not been shown to improve live birth rates for infertility patients overall.
PGT-SR: Testing for Structural Rearrangements
PGT-SR is relevant when one parent has a known chromosome structural abnormality, such as a translocation or inversion.
A parent can carry a balanced rearrangement without obvious health problems. However, embryos can inherit an unbalanced version.
ASRM recommends considering parental karyotyping in appropriate recurrent implantation failure cases to investigate structural chromosome rearrangements. When a parental abnormality is identified, genetic counseling and PGT-SR may be considered.
PGT-M: Testing for Single-Gene Conditions
PGT-M is designed for families with a known risk of passing on a specific genetic condition.
Examples can include certain inherited disorders caused by changes in a single gene.
PGT-M is different from PGT-A. It does not simply ask whether the embryo has the correct number of chromosomes. Instead, it looks for a particular genetic condition.
ACOG notes that PGT-M may be used when couples undergoing IVF have an increased risk of having a child affected by a specific genetic disorder.
6. When Should Couples Consider PGT-A?
There is no universal rule saying that PGT-A should be performed after a particular number of failed IVF cycles.
Instead, the decision should be individualized.
A fertility specialist may discuss PGT-A when factors such as the following are present:
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Repeated implantation failure involving untested embryos
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Increasing maternal age and concern about embryo aneuploidy
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Previous pregnancies or miscarriages associated with chromosome abnormalities
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A history suggesting embryo chromosome abnormalities may be contributing
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A sufficient number of blastocysts available for biopsy
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A desire to understand embryo chromosome status before transfer
ASRM’s 2026 recurrent implantation failure guidance says PGT-A could be offered in a shared decision-making model for patients with recurrent implantation failure and untested embryos, but also emphasizes that there is currently no evidence that PGT-A increases live birth rates specifically in patients with recurrent implantation failure.
That distinction is extremely important.
The goal should not be simply to “do more testing.” The goal should be to determine whether testing could provide useful information for your particular situation.
7. When Is PGT-SR More Appropriate?
PGT-SR becomes particularly relevant when genetic testing identifies a chromosome rearrangement in one of the partners.
For example, a person may have a balanced translocation. The individual may have no symptoms, yet their reproductive cells can produce embryos with unbalanced chromosome material.
If a couple has experienced repeated implantation failure, recurrent pregnancy loss, or other reproductive difficulties, their doctor may consider parental karyotyping when clinically appropriate.
If an abnormal karyotype is discovered, meeting a genetic counselor can be extremely valuable. The counselor can explain the specific rearrangement, reproductive risks, available testing options, and alternatives.
In this situation, PGT-SR is more targeted than simply ordering PGT-A without a clear genetic reason.
8. When Should Couples Consider PGT-M?
Imagine that both partners are known carriers of a particular inherited condition, or one partner has a genetic disorder that could be passed to a child.
In such cases, PGT-M may be considered during IVF.
The process generally starts with identifying the exact genetic condition and confirming the relevant genetic variants. The fertility and genetics teams then work with the laboratory to develop an appropriate testing strategy.
PGT-M can help identify embryos that are not affected by the particular condition being tested.
However, it does not eliminate the need for pregnancy testing. ACOG emphasizes that prenatal screening or diagnostic testing should still be discussed after PGT because PGT cannot detect every possible genetic or chromosomal abnormality.
9. Should Both Partners Have Genetic Testing?
In selected cases, yes.
If repeated IVF failure raises concern about a chromosome rearrangement, doctors may recommend karyotyping for both partners.
This is particularly relevant when there is a history of recurrent pregnancy loss, repeated implantation failure, or other findings that suggest a chromosomal issue.
However, genetic testing should be guided by clinical circumstances rather than performed indiscriminately.
A genetic counselor can also review:
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Family history
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Previous pregnancy outcomes
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Previous embryo testing
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Known inherited conditions
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Previous chromosome results
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Age and reproductive history
This can prevent couples from spending money on tests that are unlikely to answer their particular question.
10. What Happens During PGT?
PGT takes place as part of an IVF cycle.
First, medications are used to stimulate the ovaries so multiple eggs can develop. The eggs are collected and fertilized in the laboratory.
Embryos are then cultured until they reach the blastocyst stage. A small sample of cells is taken from the outer layer of the blastocyst and sent for genetic analysis.
The embryos are generally frozen while results are awaited.
The laboratory report may classify embryos according to the type of PGT performed. The fertility team then discusses which embryos may be appropriate for transfer.
It is important to understand that PGT does not test the entire embryo. Because only a small number of cells are sampled, results have limitations. Mosaicism can also complicate interpretation because cells in different parts of an embryo may not have identical chromosome profiles.
11. Benefits and Limitations of PGT
PGT can provide valuable information, but it is not a guarantee of pregnancy.
Potential Benefits
Depending on the clinical situation, PGT may:
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Identify embryos with specific chromosome abnormalities
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Reduce the chance of transferring an embryo known to carry a targeted genetic condition
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Help couples with known structural chromosome rearrangements select embryos for transfer
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Provide additional information when embryo genetics is a major concern
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Potentially reduce transfers of embryos unlikely to result in an ongoing pregnancy
Important Limitations
PGT also has limitations.
It can add cost, laboratory complexity, and time to an IVF treatment plan. Not every IVF cycle produces enough blastocysts for testing. Some embryos may also receive results that are difficult to interpret.
Most importantly, a PGT result is not a guarantee of a healthy baby.
False-positive and false-negative results are possible, and PGT cannot identify every genetic abnormality. ACOG recommends discussing prenatal screening and diagnostic testing even after PGT.
12. PGT After Repeated IVF Failure: What Should You Ask?
If you have experienced repeated IVF failure, consider asking your fertility specialist questions such as:
“Could embryo chromosome abnormalities explain my previous failures?”
“Should we consider karyotyping for both partners?”
“Would PGT-A provide useful information in our specific situation?”
“Is PGT-SR appropriate if a chromosome rearrangement is found?”
“Do we have enough blastocysts for PGT to be worthwhile?”
“What are the realistic benefits, costs, and limitations?”
“Would another IVF cycle without PGT be a reasonable alternative?”
These questions encourage shared decision-making rather than assuming that more testing automatically means better treatment.
ESHRE also emphasizes individualized assessment in recurrent implantation failure and notes that many proposed tests and treatments do not have sufficient evidence for routine use.
13. Choosing the Best IVF Doctor in New Delhi
Choosing a fertility specialist is an important decision, especially after repeated IVF failure.
If you are searching for the best IVF doctor in New Delhi, look beyond advertisements or success-rate claims alone.
Consider whether the clinic:
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Provides individualized treatment planning
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Reviews previous IVF cycles in detail
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Has access to experienced embryology and genetics teams
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Explains PGT benefits and limitations honestly
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Offers genetic counseling when appropriate
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Discusses alternatives instead of automatically recommending expensive tests
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Explains embryo grading and genetic testing clearly
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Provides realistic expectations rather than guarantees
A good consultation should leave you understanding why a test is being recommended, what question it answers, and how the result could change your treatment plan.
If a doctor recommends PGT, ask whether the recommendation is based on a known genetic risk, embryo chromosome concerns, age-related considerations, or another specific factor.
14. Final Thoughts
Genetic factors can contribute to recurrent IVF failure, particularly when embryo chromosome abnormalities or parental chromosome rearrangements are involved. But genetics is only one possible explanation.
PGT can be highly useful in selected couples, but it is not a universal solution for IVF failure. PGT-A, PGT-SR, and PGT-M answer different questions, so choosing the right test is essential.
If you have experienced repeated IVF failure, a careful review of your previous treatment, embryo development, reproductive history, and family history is usually a better starting point than immediately ordering every available test.
Working with an experienced fertility specialist and, when appropriate, a genetic counselor can help you make a decision based on evidence rather than fear or frustration.
15. Frequently Asked Questions
1. Can genetic problems cause repeated IVF failure?
Yes. Embryo chromosome abnormalities can contribute to implantation failure or early pregnancy loss. In some couples, a parent may also carry a structural chromosome rearrangement that affects embryo development. However, genetic factors are not responsible for every failed IVF cycle.
2. How many failed IVF cycles should occur before considering PGT?
There is no fixed number that automatically means PGT is necessary. ASRM recommends an individualized assessment. PGT-A may be discussed after recurrent implantation failure involving untested embryos, but evidence has not established that it improves live birth rates specifically in recurrent implantation failure.
3. Is PGT-A guaranteed to produce a healthy baby?
No. PGT-A primarily evaluates chromosome number and cannot detect every genetic or developmental problem. False-positive and false-negative results can occur, so prenatal screening or diagnostic testing should still be discussed during pregnancy.
4. What is the difference between PGT-A and PGT-M?
PGT-A evaluates embryos for chromosome number abnormalities, while PGT-M is designed to test for a specific inherited single-gene condition. They address different genetic concerns and are recommended in different clinical situations.
5. Should couples with recurrent IVF failure get genetic counseling?
Genetic counseling can be particularly useful when there is recurrent pregnancy loss, a known family genetic condition, an abnormal parental karyotype, or another reason to suspect a genetic contribution. A counselor can help explain test results and reproductive options in understandable terms.