Difference Between PGD and PGS

One of the things that we rapidly learn when we start dealing with issues related to infertility is that there is a whole language surrounding this part of life that we must become fluent in to understand what's going on. For example, people who are trying to get pregnant through the use of in vitro fertilization may hear the phrases "preimplantation genetic diagnosis" (PGD) and "preimplantation genetic screening" (PGS). These two phrases sound the same but they're quite different in their application for parents seeking to become pregnant through IVF. PGD is a commonly used method that allows parents to select the embroys that are least likely to have genetic problems (such as birth defects). In contrast, PGS is a process of screening all of the embryos to make sure that they have the right number of chromosomes in order to place only healthy embryos into the womb. The difference sounds slight but it can actually be significant. PGS is currently controversial in some parts of the world because of the fact that it has been reported, perhaps falsely, to increase a woman's likelihood of successful pregnancy. Some researchers now believe that this method of testing doesn't actually improve a woman's chances of conceiving and delivering a child. In contrast, PGD is known to be successful for rooting out specific genetic diseases in the embryos. Learn more here. Question of the Day: Do you understand the difference between PGD and PGS? photo link
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