• Preimplantation genetic diagnosis (PGD) tests an embryo for genetic disorders during the in vitro fertilization process."Cell Culture" is Copyrighted by Flickr user: kaibara87 (Umberto Salvagnin) under the Creative Commons Attribution license.
  
  

Procedure

• PGD testing is usually done after eggs are fertilized and before they are implanted in a woman's uterus. One or two cells are removed from each embryo are removed and tested when the embryo is at the 4- to 10-cell stage.
  
  

Uses

• PGD can test for ovarian and breast cancers, Marfan syndrome and pancreatic cancer. Down's syndrome and muscular dystrophy can also be tested for with PGD.
  
  

Eligibility

• Women who have had recurrent miscarriages may be offered PGD, according to FertilityFactor.com. Women older than 35 and those unable to get pregnant after repeated attempts at in vitro fertilization may be eligible as well.
  
  

Ethics

• PGD's proponents think the tests' findings could eliminate some diseases. Its critics think the testing puts too much emphasis on people being flawless, according to DocShop.com.
  
  

Cost

• PGD testing is not a normal part of the in vitro fertilization process. FertilityFactor states that PGD can cost between $45,000 and $75,000.