Preimplantation genetic testing (PGT) is a technique used in reproductive medicine to identify genetic abnormalities in embryos (less commonly, polar bodies of eggs) created through in vitro fertilization..

Preimplantation genetic diagnosis (PGD) has been used since 1990 and has become one of the fastest growing techniques in assisted reproduction. The purpose of this embryo biopsy technique is to screen healthy embryos in couples who are at high risk of having a child with a genetic disorder.

Thalassemia is the most common recessive genetic disease in the world, accounting for about 4.8% of the global population. In Vietnam, the rate of disease gene carriers in Kinh people is 2 - 4%. This rate is very high in the Muong, Tay, Thai ethnic groups at 22%; Ede, Stieng ethnic groups at over 40%. This is a genetic disease, father and/or mother pass on the disease gene to their children. The disease occurs in both men and women.

In IVF, selecting a good embryo to prepare for transfer plays a very important role. Especially in cases where there are many embryos. If the embryo has a good morphology, the doctor and the couple will usually expect the embryo to have good development potential.