Non-invasive Preimplantation Genetic Screening (niPGTA) in Oocyte Donation Patients.

Preimplantation genetic testing for aneuploidies (PGT-A) is widely used in IVF to improve embryo selection and pregnancy outcomes. However, it requires invasive embryo biopsy and has not shown clear benefit in egg donation cycles, where embryos originate from young donors with lower aneuploidy rates. Non-invasive PGT-A (niPGTA), based on the analysis of cell-free embryonic DNA released into the culture medium, represents a promising alternative that avoids embryo biopsy.

This prospective, blinded, non-selection study will include women undergoing egg donation treatment. Embryos will be selected for transfer using standard morphological criteria only, while niPGTA results will not influence clinical decisions. After embryo transfer, the spent culture medium will be collected and analyzed using next-generation sequencing to determine the presence of chromosomal aneuploidies.

The study aims to evaluate whether aneuploidy detected by niPGTA is associated with implantation failure, biochemical pregnancy loss, and clinical miscarriage. By comparing niPGTA results between embryos that result in pregnancy and those that do not, this project will assess the potential clinical value of niPGTA as a non-invasive embryo selection tool in egg donation cycles.