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Preimplantation Genetic Testing (PGT) is a technique used in conjunction with in vitro fertilization (IVF) to determine the genetic makeup of embryos before they are implanted into the uterus. This testing can identify the sex chromosomes (XX for female and XY for male) of the embryos, allowing for gender selection.

Here's a brief overview of how it works:

1. **IVF Process**: Eggs are retrieved from the female and fertilized with sperm in a lab to create embryos.
2. **Embryo Biopsy**: A few cells are taken from each embryo.
3. **Genetic Testing**: These cells are tested to determine the genetic makeup, including the sex chromosomes.
4. **Selection and Transfer**: Embryos of the desired gender are selected and transferred to the uterus for implantation.

PGT is nearly 100% accurate for determining the sex of the embryo³. This method is often used for family balancing or to avoid sex-linked genetic disorders.

If you have any more questions or need further details, feel free to ask!