通常，夫妻在需要这些技术都没有薄但有一个条件的家族史，并希望减少具有显著的健康问题或过早死亡另一个孩子的风险。bob体育足球比分 Through generally available genetic screening, however, occasionally couples who are seeking fertility treatment are found to be at risk of passing on an inherited condition, and PGD may be an option for them.
PGD功能，实现了其确切的突变被称为几乎所有的遗传性疾病。 A unique test must be developed for each couple, however. This test design may take up to several months to complete before beginning an IVF cycle.
PGD使用体外受精（IVF），其中多个卵成熟和检索。 The oocytes — or primitive egg cells — are inseminated with a single sperm using胞浆内单精子注射。
由此产生的胚胎被培养中生长，直至六到八细胞阶段，这是胚胎发育第3天。 At this point, the embryo is biopsied with the removal of one to two cells. This process does not damage the cells remaining within the embryo.
对于特定的遗传条件的分离的细胞进行了评价。 Embryos that are found to be unaffected are transferred back to the woman's uterus on day five of embryo development.
- 聚合酶链反应（PCR）在PCR，感兴趣的基因的多个副本是由放大的工艺制成。 This amplification process allows the identification of very small amounts of DNA to make the diagnosis.
- 荧光原位杂交（FISH）FISH允许实验室计数在分离的细胞的染色体的数目。 This technique is used primarily for expected abnormalities in chromosome number, such as Down syndrome, or translocations (defects in the structure of the chromosome).
加州大学旧金山分校，我们的胚胎实验室工作人员已经与胚胎显微和活检丰富的经验。 Our genetic counselor is available to coordinate your cycle with the IVF team and the PGD laboratory, to make the process as smooth as possible.