<Li> Prenatal diagnosis . If both parents are identified as carriers, prenatal genetic testing can determine whether the fetus has inherited a defective gene copy from both parents . Chorionic villus sampling (CVS), the most common form of prenatal diagnosis, can be performed between 10 and 14 weeks of gestation . Amniocentesis is usually performed at 15--18 weeks . These procedures have risks of miscarriage of 1% or less . </Li> <Li> Preimplantation genetic diagnosis . By retrieving the mother's eggs for in vitro fertilization, it is possible to test the embryo for the disorder prior to implantation . Healthy embryos are then selected and transferred into the mother's womb, while unhealthy embryos are discarded . In addition to Tay--Sachs disease, preimplantation genetic diagnosis has been used to prevent cystic fibrosis and sickle cell anemia among other genetic disorders . </Li> <Li> Mate selection . In Orthodox Jewish circles, the organization Dor Yeshorim carries out an anonymous screening program so that carrier couples for Tay--Sachs and other genetic disorders can avoid marriage . </Li> <P> As of 2010 there was no treatment that addressed the cause of Tay--Sachs disease or could slow its progression; people receive supportive care to ease the symptoms and extend life by reducing the chance of contracting infections . Infants are given feeding tubes when they can no longer swallow . In late - onset Tay--Sachs, medication (e.g., lithium for depression) can sometimes control psychiatric symptoms and seizures, although some medications (e.g., tricyclic antidepressants, phenothiazines, haloperidol, and risperidone) are associated with significant adverse effects . </P>

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