Pre-implantation genetic testing for aneuploidies (PGT-A) (formerly known as pre-implantation genetic screening (PGS)) is a test used alongside IVF.

Pre-implantation genetic testing for aneuploidies (PGT-A) is a selection too to increase the chance of a healthy on-going pregnancy.

The success of IVF depends on a number of factors including a woman’s age, fertility diagnosis, number of embryos produced, and embryo quality. PGT-A provides important information about chromosomal health of embryos before transfer so we can select the embryo most likely to lead to a successful pregnancy.

A few cells are removed from each embryo created in an IVF cycle and the number of chromosomes in each embryo cell are counted. An embryo with a normal number of chromosomes can therefore be chosen to be transferred, and this is thought to give a higher chance of creating healthy baby. By excluding the abnormal embryos, PGT-A helps to prevent the possible transfer of embryos which would end up not implanting, miscarrying or resulting in the birth of a child affected by an abnormal number of chromosomes. However, this screening may also result in no embryos being found that are normal so no transfer can take place.

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