At a glance
Learn how to understand PGT-A results, including euploid, aneuploid, and mosaic outcomes, and what they mean for your embryo transfer decisions.
If you are waiting for PGT-A results, you likely have questions about what the findings will mean for your IVF journey. This guide explains the types of results you may receive, how to interpret them, and what they might mean for your next steps. Remember, PGT-A is a screening tool, not a guarantee of pregnancy or a healthy baby. Your clinic will provide personalized advice based on your results and medical history.
At a Glance: Key Points About PGT-A Results
- PGT-A screens embryos for chromosomal abnormalities before transfer.
- Results are typically reported as euploid, aneuploid, or mosaic.
- Euploid embryos have the expected number of chromosomes and are usually prioritized for transfer.
- Aneuploid embryos have missing or extra chromosomes and are generally not transferred.
- Mosaic embryos have a mix of normal and abnormal cells; their transfer may be considered in certain situations.
- PGT-A does not guarantee a successful pregnancy or a healthy baby.
What Is PGT-A?
Preimplantation Genetic Testing for Aneuploidy (PGT-A) is a test performed on embryos created through IVF. It checks for the correct number of chromosomes. Humans typically have 46 chromosomes in each cell. Having too many or too few chromosomes can lead to implantation failure, miscarriage, or genetic conditions such as Down syndrome.
PGT-A is optional and not necessary for everyone. Your doctor may recommend it based on your age, medical history, or previous IVF outcomes. It is important to discuss the benefits, limitations, and costs with your clinic.
Understanding Your PGT-A Results
PGT-A results are usually reported as one of the following:
Euploid
A euploid embryo has the expected number of chromosomes (46). This is considered a normal result. Euploid embryos have the highest chance of implanting and developing into a healthy baby, but they do not guarantee a successful pregnancy. Other factors, such as embryo quality and uterine environment, also matter.
Aneuploid
An aneuploid embryo has missing or extra chromosomes. For example, trisomy 21 (three copies of chromosome 21) causes Down syndrome. Aneuploid embryos are generally not transferred because they are unlikely to result in a live birth and may cause miscarriage. Your clinic will discuss options, which may include discarding the embryo or, in some cases, using it for research (with your consent).
Mosaic
A mosaic embryo has a mixture of cells with normal chromosomes and cells with abnormal chromosomes. The percentage of abnormal cells is usually reported. Mosaic embryos may have a lower chance of implantation than euploid embryos, but some can still lead to a healthy baby. The decision to transfer a mosaic embryo is complex and depends on the specific chromosomes involved, the percentage of abnormal cells, and your personal circumstances. Your clinic may recommend genetic counseling to help you decide.
What Do PGT-A Results Mean for Transfer Decisions?
Your doctor will use your PGT-A results, along with other factors, to recommend which embryo(s) to transfer. Typically, euploid embryos are prioritized. If you have no euploid embryos, your doctor may discuss the option of transferring a mosaic embryo, but this is not always recommended. Aneuploid embryos are usually not transferred.
It is important to understand that PGT-A does not test for all genetic conditions. It only screens for chromosomal abnormalities. Other genetic tests, such as PGT-M, are used for specific inherited diseases.
Questions to Ask Your Clinic
- What type of PGT test was performed on my embryos?
- How are my results reported? What is the exact terminology?
- What is the percentage of abnormal cells in a mosaic embryo, and which chromosomes are affected?
- What are the success rates for transferring euploid versus mosaic embryos in my age group?
- Are there any additional tests I should consider?
- What are the costs associated with PGT and any follow-up testing?
Next Steps After Receiving Your Results
- Schedule a consultation with your doctor to review your results in detail.
- Ask for a written copy of your results and any relevant reports.
- Discuss the implications for your transfer plan, including timing and number of embryos to transfer.
- If you have mosaic embryos, ask about genetic counseling to understand the risks and options.
- Consider your emotional well-being; waiting for results can be stressful. Seek support from your clinic or a counselor if needed.
Limitations of PGT-A
PGT-A is a powerful tool, but it has limitations. It cannot guarantee a successful pregnancy or a healthy baby. Embryos can be damaged during the biopsy process, although this is rare. Also, PGT-A may not detect all chromosomal abnormalities, and some embryos may be misclassified. The accuracy of the test depends on the laboratory and the technology used.
Furthermore, PGT-A does not test for single-gene disorders (like cystic fibrosis) or structural rearrangements (like translocations). Those require PGT-M or PGT-SR, respectively. Your clinic can explain which tests are appropriate for your situation.
Frequently Asked Questions
What is the difference between PGT-A and PGT-M?
PGT-A screens for chromosomal abnormalities (aneuploidy), while PGT-M tests for specific single-gene disorders that are inherited. PGT-M is used when one or both parents carry a known genetic mutation.
Can a mosaic embryo result in a healthy baby?
Yes, some mosaic embryos can lead to a healthy baby, but the chance is generally lower than with a euploid embryo. The outcome depends on the specific chromosomes involved and the percentage of abnormal cells. Your clinic can provide more personalized information.
What if all my embryos are aneuploid?
If all embryos are aneuploid, they are typically not transferred. Your doctor will discuss options, which may include a new IVF cycle, using donor eggs or sperm, or considering other family-building options. Genetic counseling can help you explore these choices.
Is PGT-A mandatory for IVF?
No, PGT-A is optional. It is not necessary for all patients. Your doctor may recommend it based on your age, medical history, or previous IVF outcomes. Discuss the pros and cons with your clinic to make an informed decision.
How long does it take to get PGT-A results?
The time to receive results varies by laboratory and the testing method used. Your clinic will provide an estimated timeline. Typically, results may take several days to a few weeks.
Related Resources
For more information about PGT in Thailand, visit our PGT in Thailand page. You can also explore our guides and FAQ sections for additional support.
Frequently asked questions
What is the difference between PGT-A and PGT-M?
PGT-A screens for chromosomal abnormalities (aneuploidy), while PGT-M tests for specific single-gene disorders that are inherited. PGT-M is used when one or both parents carry a known genetic mutation.
Can a mosaic embryo result in a healthy baby?
Yes, some mosaic embryos can lead to a healthy baby, but the chance is generally lower than with a euploid embryo. The outcome depends on the specific chromosomes involved and the percentage of abnormal cells. Your clinic can provide more personalized information.
What if all my embryos are aneuploid?
If all embryos are aneuploid, they are typically not transferred. Your doctor will discuss options, which may include a new IVF cycle, using donor eggs or sperm, or considering other family-building options. Genetic counseling can help you explore these choices.
Is PGT-A mandatory for IVF?
No, PGT-A is optional. It is not necessary for all patients. Your doctor may recommend it based on your age, medical history, or previous IVF outcomes. Discuss the pros and cons with your clinic to make an informed decision.
How long does it take to get PGT-A results?
The time to receive results varies by laboratory and the testing method used. Your clinic will provide an estimated timeline. Typically, results may take several days to a few weeks.
Continue your research
Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.
Need help turning research into a shortlist?
