PGT-SR: Genetic Testing for Chromosomal Rearrangements in Kanpur

PGT-SR is genetic testing used during IVF to assess embryos for unbalanced chromosome changes linked to a known parental structural rearrangement. For couples exploring PGT-SR chromosomal rearrangements Kanpur, it may help identify embryos suitable for transfer, but it cannot guarantee pregnancy or a healthy baby. Genetic counselling helps you understand whether this approach fits your family's situation.

A chromosome report can feel overwhelming, especially after miscarriage or difficulty conceiving. At PRAVI IVF & Fertility Centre, Kanpur, you can discuss your reports and fertility concerns to understand the next steps without feeling rushed into treatment.

What are chromosomal rearrangements?

Chromosomes are packages of genetic material inside our cells. A structural rearrangement means that part of a chromosome has changed position or direction. This is different from simply having an extra or missing whole chromosome.

Someone with a balanced rearrangement usually has no significant loss or gain of genetic material and may be healthy. However, some eggs or sperm may receive an unbalanced amount of chromosome material. This can affect embryo development, contribute to miscarriage or lead to a child with health or developmental difficulties.

Common types discussed in genetic counselling

• Reciprocal translocation: Parts of two different chromosomes exchange places.
• Robertsonian translocation: Two particular types of chromosomes join together.
• Inversion: A section of a chromosome is reversed within the same chromosome.

The reproductive implications depend on the exact rearrangement. Two couples with a diagnosis of “translocation” may have different risks and testing options. Being a carrier is nobody's fault, and the finding may have been inherited without anyone knowing.

What does PGT-SR test for?

PGT-SR stands for preimplantation genetic testing for structural rearrangements. It examines a small sample of cells from an IVF embryo for chromosome imbalances associated with the rearrangement identified in a parent.

The laboratory must review the chromosome report before treatment to check whether a suitable test can be offered and what it can detect. Not every rearrangement can be assessed equally well with every testing method.

Importantly, many PGT-SR methods cannot distinguish an embryo with normal chromosomes from one carrying the same balanced rearrangement as the parent. Both may be reported as normal/balanced and considered for transfer, depending on the findings and counselling.

Who may consider PGT-SR in Kanpur?

PGT-SR is generally considered when one partner has a confirmed structural chromosome rearrangement with a risk of producing unbalanced embryos. It is not a routine test for every couple starting IVF.

A specialist may discuss it when there is:

• A known balanced translocation or other relevant rearrangement in either partner.
• Repeated pregnancy loss followed by a parental chromosome finding.
• A previous pregnancy or child affected by an unbalanced chromosome rearrangement.
• A family history that leads to chromosome testing and an identified carrier.

Miscarriage and infertility have many possible causes. These experiences alone do not prove that a chromosomal rearrangement is present. Your doctor can advise whether a blood chromosome test, called a karyotype, is appropriate.

How does the PGT-SR process work?

1. Review reports and receive genetic counselling

The starting point is usually the original karyotype report, along with previous pregnancy and fertility records. A genetic counsellor or clinical geneticist explains the specific finding, reproductive risks and available choices. The testing laboratory confirms feasibility and any preparation required.

2. Create embryos through IVF

PGT-SR requires embryos to be created outside the body. Ovarian stimulation and egg collection are followed by fertilisation in the laboratory. You can read about the wider treatment process on our IVF in Kanpur page.

The fertilisation method is chosen according to clinical and laboratory needs. Not every egg fertilises, and not every embryo develops far enough to be tested.

3. Sample and freeze suitable embryos

Embryos that reach a suitable blastocyst stage may undergo biopsy. A trained embryologist removes a few cells from the outer layer, which mainly contributes to the placenta. Embryos are generally frozen while the genetic laboratory analyses the samples.

Biopsy and freezing are established procedures, but they are not risk-free. Your team should explain possible embryo damage, survival after warming and the chance of receiving no clear test result.

4. Review results and plan transfer

The fertility team and genetics professionals interpret the report together. If an embryo is considered suitable, a frozen embryo transfer may be planned. Sometimes no suitable embryo is identified, and another treatment cycle or a different approach may be discussed.

Our embryo genetic testing information offers an introduction to testing terminology. Older terms such as PGD or PGS may still appear in records, so ask which specific test is being recommended.

PGT-SR, PGT-A and PGT-M: what is the difference?

• PGT-SR assesses chromosome imbalances associated with a known structural rearrangement.
• PGT-A assesses embryos for abnormalities in chromosome number.
• PGT-M tests for a specific single-gene condition identified in a family.

These tests answer different questions and are not interchangeable. Some laboratory methods assess additional chromosome abnormalities alongside the rearrangement, but the exact scope should be explained before you consent. Testing more broadly is not automatically necessary for every couple.

Benefits and limitations to understand

PGT-SR can help avoid transferring embryos with detectable unbalanced chromosome changes covered by the test. For some couples, this may reduce the likelihood of a pregnancy affected by that imbalance and related miscarriage. It does not remove all causes of pregnancy loss.

Important limitations include:

• No embryo suitable for transfer may be available after testing.
• A small biopsy may not fully represent every cell in an embryo.
• Mosaic or inconclusive findings can make interpretation more complex.
• Small chromosome changes, unrelated genetic conditions and other health problems may not be detected.
• A suitable result does not guarantee implantation, an ongoing pregnancy or a healthy child.

The number of eggs obtained, embryo development and the specific rearrangement all affect the options available. Ask for an individual explanation rather than relying on another couple's experience.

Is testing during pregnancy still needed?

After pregnancy is established, prenatal testing options should still be discussed. PGT-SR is not a replacement for prenatal care or diagnostic testing.

Chorionic villus sampling or amniocentesis may be offered to confirm chromosome findings. A prenatal genetics specialist can explain their timing, benefits and risks. Screening tests, including NIPT, do not provide the same diagnostic information and may not detect the relevant imbalance.

Making a decision that feels right for you

PGT-SR is one reproductive option, not an obligation. Depending on your circumstances, alternatives may include natural conception with prenatal diagnosis or donor eggs or sperm. Your medical history, emotional readiness and personal values all matter.

Bring the complete chromosome report, previous pregnancy records and any earlier embryo testing reports to your consultation. Ask what the test can detect, whether it distinguishes balanced carriers, and what happens if no suitable embryo is available. You can also explore our fertility experts before your visit.

If you are considering PGT-SR in Kanpur, book an appointment at PRAVI IVF & Fertility Centre to discuss your reports and next steps. You can also message us on WhatsApp +91 80091 50040.