IVF for Sex Selection
IVF for sex selection is a specialized use of in vitro fertilization designed specifically to identify and select embryos of a desired sex before pregnancy begins.
This process uses standard IVF techniques combined with advanced genetic testing to accurately determine embryo sex, allowing patients to plan pregnancy with intention and clarity (where permitted by local regulations).
How sex selection is achieved (clinic-standard approach)
Ovarian stimulation
Hormonal medications are used to stimulate the ovaries to produce multiple mature eggs in a single cycle. Progress is closely monitored with ultrasound and blood tests.
Egg retrieval
Mature eggs are collected through a minimally invasive procedure performed under light sedation or anesthesia.
Fertilization
Fertilization occurs in the laboratory using:
ICSI (Intracytoplasmic Sperm Injection) — the preferred method for sex selection cycles, ensuring controlled fertilization and optimal embryo development.
Embryo culture
Fertilized eggs are cultured for 5–6 days until they reach the blastocyst stage, which is required for accurate genetic testing.
Genetic testing for sex determination
Preimplantation Genetic Testing (PGT)
At the blastocyst stage:
- A small number of cells are biopsied from the outer layer of the embryo
- The embryo is safely cryopreserved
- Biopsied cells are analyzed by a certified genetics laboratory
PGT identifies:
- Chromosomal normality (to confirm embryo health)
- Sex chromosomes (XX or XY)
This allows embryos to be classified by both health and sex.
Embryo selection and transfer
Once genetic results are available:
- Only chromosomally normal (euploid) embryos are considered
- Patients may choose to transfer:
- A healthy embryo of the desired sex, or
- Defer transfer and preserve embryos for future use
The selected embryo is transferred into the uterus in a planned cycle.
Accuracy and expectations
- Sex determination accuracy: greater than 99%
- Key considerations:
- Availability of a specific sex depends on embryo development results
- Not all embryos will be genetically normal
- Pregnancy outcomes cannot be guaranteed
Sex selection is therefore highly accurate, but dependent on biological outcomes.
Important clinical clarification
- Sex is not determined at fertilization
- Sex is identified after embryo development through genetic analysis
- Sperm sorting alone is not considered a reliable or standard clinical method
