What is Preimplantation Genetic Testing (PGT)?

Preimplantation Genetic Screening (PGS) is an advanced genetic testing technique used during in vitro fertilization (IVF) to screen embryos for chromosomal abnormalities before they are transferred into the uterus. The goal of PGS is to improve the chances of a successful pregnancy and healthy baby by selecting embryos with the correct number of chromosomes (euploid embryos). PGS can also identify the gender of each embryo, allowing for gender selection if desired.

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How Does PGT Work?

What is PGT testing
A small number of cells are carefully removed (biopsied) from each embryo. This procedure does not harm the embryo and allows for detailed genetic analysis.
The biopsied cells are analyzed to count the number of chromosomes. Normal embryos should have 46 chromosomes (23 pairs), while abnormal embryos may have extra or missing chromosomes, leading to conditions like Down syndrome (trisomy 21).
Based on the PGS results, the healthiest embryos with the correct number of chromosomes are selected for transfer. This process can also identify the gender of the embryos if the parents wish to select the sex of their baby.
The selected embryo(s) are then transferred into the woman’s uterus in the hope of achieving a successful pregnancy.

Who Should Consider PGT?

Women over 35 have a higher risk of producing eggs with chromosomal abnormalities, which can lead to miscarriage or genetic disorders. PGT helps identify healthy embryos.
PGT can help identify chromosomally normal embryos, reducing the risk of miscarriage.
Although PGT does not detect specific genetic diseases (that requires Preimplantation Genetic Diagnosis, or PGD), it can screen for chromosomal abnormalities that might cause genetic disorders.
PGT can improve IVF success rates by ensuring only chromosomally normal embryos are transferred, leading to higher implantation rates and reduced risk of miscarriage.
PGT can determine the sex of the embryos, allowing for family balancing or avoiding sex-linked genetic disorders.
By transferring only chromosomally normal embryos, PGS increases the chances of implantation and reduces the likelihood of miscarriage.
PGT helps avoid transferring embryos with chromosomal abnormalities that could lead to conditions like Down syndrome, Turner syndrome, or other genetic conditions.
PGS provides detailed information about each embryo, allowing parents and doctors to make more informed decisions regarding embryo selection.
With PGS, couples may opt for a single embryo transfer, reducing the risk of multiple pregnancies while maintaining high success rates.

Benefits of PGT

Benefits of PGT

By transferring only chromosomally normal embryos, PGS increases the chances of implantation and reduces the likelihood of miscarriage.
PGT helps avoid transferring embryos with chromosomal abnormalities that could lead to conditions like Down syndrome, Turner syndrome, or other genetic conditions.
PGS provides detailed information about each embryo, allowing parents and doctors to make more informed decisions regarding embryo selection.
With PGS, couples may opt for a single embryo transfer, reducing the risk of multiple pregnancies while maintaining high success rates.
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PGS vs. PGD: What’s the Difference?

PGT (Preimplantation Genetic Testing)
Focuses on screening embryos for overall chromosomal abnormalities, such as an incorrect number of chromosomes.
PGD (Preimplantation Genetic Diagnosis)
Used to identify specific genetic disorders in embryos, particularly when one or both parents carry a known genetic mutation.
Preimplantation Genetic Testing (PGT) offers a valuable tool for improving the success rates of IVF by ensuring that only chromosomally normal embryos are transferred.
It is particularly beneficial for older women, couples with a history of miscarriage, or those concerned about chromosomal abnormalities.
While it adds to the cost of IVF, the potential benefits in terms of successful pregnancies and healthy babies make it a worthwhile consideration for many couples.
Always consult with your fertility specialist to determine if PGT is the right option for you.

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    Frequently Asked Questions

    Yes, PGT involves a small biopsy of cells from the embryo, which is typically safe and does not harm the embryo’s ability to develop.
    While PGT increases the chances of a healthy pregnancy, it does not guarantee it. Other factors like maternal health, uterine conditions, and lifestyle also influence the outcome.
    PGT is highly accurate, with success rates over 98% in identifying chromosomal abnormalities.
    Yes, PGT can determine the sex of the embryo, allowing couples to choose the gender if desired.

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