PGD is an advanced technology that allows genetic analysis of embryos to screen for aneuploidies (chromosomal abnormalities) and specific genetic disorders. For PGD, a biopsy is performed on the embryo on day 5, and the collected cells are sent to the genetic laboratory for analysis. Based on the results, a suitable embryo can be transferred to the patient on the same day. Since PGD screens a limited number of chromosomes, it provides results in a shorter time and is more cost-effective.
PGD, increasingly used worldwide and in our country among IVF patients, is especially recommended for couples with a high risk of creating embryos with chromosomal abnormalities, such as:
Advanced maternal age
Family history of sex chromosome-linked disorders
Recurrent miscarriages
Repeated unsuccessful IVF attempts
Chromosomal abnormalities in parents (translocations, inversions, etc.)
Previous pregnancy with chromosomal abnormalities
On the day of egg retrieval, sperm cells taken from the male partner are injected directly into the eggs using the ICSI technique. The fertilized eggs are monitored in the laboratory, and on day 3, a biopsy is taken from each embryo for analysis. After screening, healthy embryos are identified, and the transfer of the selected embryo into the uterus completes the treatment.
PGD is also frequently used for determining sex chromosomes within a short timeframe.
It is important to note that even if the patient has previously conceived or given birth, pregnancy is never guaranteed to be 100%. Success rates vary depending on the woman’s age, egg count, and embryo quality.
Stay Healthy,
Cyprus American IVF Center
Frequently Asked Questions About PGD in IVF
What is PGD in IVF?
PGD, or Preimplantation Genetic Diagnosis, is a genetic testing method used during IVF to examine embryos before transfer. It helps identify selected chromosomal abnormalities and specific genetic disorders.
Why is PGD performed?
PGD is performed to help select genetically suitable embryos before embryo transfer. It may reduce the risk of transferring embryos with certain chromosomal abnormalities or inherited genetic conditions.
Who can benefit from PGD?
PGD may be recommended for couples with advanced maternal age, recurrent miscarriages, repeated failed IVF attempts, parental chromosomal abnormalities, previous pregnancies with chromosomal problems, or a family history of sex chromosome-linked disorders.
How is PGD performed?
During IVF, eggs are fertilized with sperm using the ICSI technique. Embryos are monitored in the laboratory, and a biopsy is taken from the embryo for genetic analysis. Based on the results, a suitable embryo is selected for transfer.
When is embryo biopsy done for PGD?
Embryo biopsy for PGD may be performed on day 3 or day 5 of embryo development, depending on the treatment plan and laboratory protocol.
How long does PGD testing take?
PGD usually provides results in a shorter time than comprehensive chromosome screening because it examines a limited number of chromosomes or specific genetic conditions. In some cases, embryo transfer may be planned shortly after results are available.
What conditions can PGD detect?
PGD may detect selected chromosomal abnormalities, aneuploidies, sex chromosome-linked disorders, and specific inherited genetic diseases, depending on the test panel used.
Can PGD be used for gender selection?
Yes. PGD can identify sex chromosomes and may be used for gender selection where legally permitted and medically appropriate.
Is PGD the same as NGS?
No. PGD and NGS are not exactly the same. PGD is a genetic diagnosis approach that may screen selected chromosomes or specific disorders, while NGS is a newer technology that can examine all 46 chromosomes more comprehensively.
What is the difference between PGD and NGS?
PGD generally screens a limited number of chromosomes or specific genetic conditions, which may make it faster and more cost-effective. NGS provides a broader chromosomal analysis of all 46 chromosomes and may offer more detailed screening.
Does PGD increase IVF success?
PGD may support IVF success by helping select genetically suitable embryos for transfer. However, pregnancy success also depends on the woman’s age, egg count, embryo quality, sperm quality, uterine health, and overall treatment plan.
Does PGD guarantee pregnancy?
No. PGD does not guarantee pregnancy. Even if a genetically suitable embryo is selected, implantation and pregnancy depend on several biological and medical factors.
Can PGD reduce miscarriage risk?
PGD may help reduce miscarriage risk related to certain chromosomal abnormalities by identifying affected embryos before transfer. However, not all causes of miscarriage can be detected or prevented with PGD.
Is PGD recommended after recurrent miscarriage?
Yes. PGD may be recommended for couples with recurrent miscarriages, especially when chromosomal abnormalities or inherited genetic risks are suspected.
Is PGD recommended after failed IVF attempts?
PGD may be considered after repeated unsuccessful IVF attempts, particularly if embryo chromosomal problems are suspected as a possible cause.
Are embryos transferred on the same day after PGD?
In some PGD protocols, results may be available quickly enough for same-day or fresh embryo transfer. In other cases, embryos may be frozen and transferred later after results are finalized.
What is ICSI in PGD treatment?
ICSI, or intracytoplasmic sperm injection, is a fertilization technique in which a single sperm cell is injected directly into an egg. It is commonly used in IVF cycles involving PGD.
What should couples consider before PGD?
Couples should understand the biopsy process, what PGD can and cannot detect, testing limitations, legal regulations, transfer timing, success rates, costs, and whether PGD is medically suitable for their case.
