PGD: Paving the Way for Healthy Pregnancies
Preimplantation Genetic Diagnosis (PGD) is a groundbreaking component of in vitro fertilization (IVF) that adds a layer of precision to the process of selecting embryos for transfer. This advanced genetic screening technique provides valuable insights into the genetic health of embryos before implantation, significantly contributing to the likelihood of a successful pregnancy.
Why PGD during IVF?
The primary goal of PGD during IVF is to assess the genetic makeup of embryos before they are implanted in the uterus. This meticulous examination is especially crucial in cases where there is an advanced maternal age, a history of genetic diseases, repeated miscarriages, or repeated IVF failures. It is also used for family balancing. PGD can help identify embryos with the highest potential for successful implantation and healthy development.
The PGD Process during IVF:
01. Embryo Development
After eggs are retrieved and fertilized in the laboratory through IVF, embryos undergo development.
02. Biopsy
On day three or five of development, a small biopsy is performed on embryos considered suitable for testing. This involves removing a few cells from the embryo.
03. Genetic Analysis
The genetic material within the removed cells is then analyzed to identify any chromosomal abnormalities or specific genetic conditions. The results are 98%-99% accurate.
04. Embryo Vitrification (in case of a day 5 biopsy)
Post-biopsy, embryos are vitrified to preserve their viability while awaiting the results of the genetic analysis.
05. Transfer Decision
Based on the results, only embryos with a normal genetic profile are selected for transfer into the uterus during the same cycle (in case of a day 3 biopsy) or during a subsequent frozen embryo transfer (FET) cycle (in case of a day 5 biopsy).
Choosing Embryos for Transfer: Embryos with both normal genetic testing and morphology are chosen for transfer. While morphology is considered, PGD results provide a more accurate selection, identifying embryos with the highest chance of a healthy pregnancy. Decisions on embryo transfer and the use of remaining embryos are made collaboratively between the couple and our medical team.
Benefits of PGD during IVF:
Increased chances of embryo implantation.
Reduced risk of miscarriage.
Higher likelihood of a healthy pregnancy.
Enhanced efficiency, potentially reducing the need for multiple IVF cycles.
When it comes to Preimplantation Genetic Diagnosis (PGD), think of it as having a toolbox filled with different tools, each designed to provide a unique perspective on your embryo’s genetic health. Here’s a simple breakdown:
01. Fluorescence In Situ Hybridization (FISH):
Think of FISH as your early genetic explorer. It uses special lights to check a few specific genetic landmarks in embryos. It checks for abnormalities in some chromosomes, most commonly 13, 18, 21.
02. Next-Generation Sequencing (NGS):
NGS is a more advanced type of genetic analysis. It can read the entire genetic story of an embryo, helping us understand it in incredible detail. It checks for abnormalities in all the chromosomes
03. Fluorescence In Situ Hybridization (FISH):
PCR is the targeted spotlight on specific genetic areas. It amplifies those areas, helping us see if everything is just right. It checks for specific abnormalities in the genes within the chromosomes. It is mostly used in cases of thalassemia, cystic fibrosis, Duchenne muscular dystrophy and HLA typing.
A vital step involves genetic testing for the parents, and sometimes even for their child, typically through a blood test. This initial genetic testing helps identify specific genetic markers or potential risks guiding the subsequent PCR analysis during the process.
Preimplantation Genetic Testing during IVF empowers couples with valuable information, allowing them to make informed decisions on embryo selection and increasing the probability of a successful and healthy pregnancy.