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OtherPractice

Genetics

Preimplantation genetic diagnosis

Clare A. Gibbons, Judith Allanson, Sean M. Blaine, Carol Cremin, Heather Dorman, Christina Honeywell, Wendy S. Meschino, Joanne Permaul and June C. Carroll
Canadian Family Physician March 2010; 56 (3) 247;
Clare A. Gibbons
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Judith Allanson
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Sean M. Blaine
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Carol Cremin
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Heather Dorman
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Christina Honeywell
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Wendy S. Meschino
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Joanne Permaul
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June C. Carroll
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Preimplantation genetic diagnosis (PGD) involves producing fertilized oocytes in vitro, which are then cultured until they reach the 8-cell blastomere stage. A single cell is removed from the embryo and tested for a specific genetic disease or chromosome abnormality. The embryos that have negative results for the disease are transferred to the woman’s uterus. If the embryo implants and becomes a viable pregnancy, it is expected to be unaffected by the tested disease.

Bottom line. A couple who wishes to avoid both prenatal testing and making decisions about terminating an affected pregnancy but who also wishes to avoid having a child with a specific genetic disease might be interested in PGD; they should receive genetic counseling beforehand. Patients are responsible for covering the substantial costs of the in vitro fertilization and PGD procedures, and they should be aware of the possible need for multiple cycles and the pregnancy success rate of 30% to 45%.

The complete Gene Messenger—Preimplantation Genetic Diagnosis by the GenetiKit research team is available on CFPlus.* Past Gene Messenger articles can be accessed online at www.cfp.ca. On the home page, click on Collections in the left-hand menu, then click on Genetics.

Acknowledgments

Funding was provided by the Canadian Institutes of Health Research.

Footnotes

  • Competing interests

    None declared

  • The GenetiKit research team, a group of family physicians, genetic counselors and geneticists, designed the Gene Messenger series to provide practical information to help family physicians and their patients make informed choices about rapidly emerging genetic discoveries. The series is a collection of up-to-date, definitive, short reviews on genetics topics that have made headlines, and offers recommendations regarding referral for genetic services or testing.

  • ↵* The Gene Messenger on preimplantation genetic diagnosis is available at www.cfp.ca. Go to the full text of this article online, then click on CFPlus in the menu at the top right-hand side of the page.

  • Copyright© the College of Family Physicians of Canada
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Canadian Family Physician: 56 (3)
Canadian Family Physician
Vol. 56, Issue 3
1 Mar 2010
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Genetics
Clare A. Gibbons, Judith Allanson, Sean M. Blaine, Carol Cremin, Heather Dorman, Christina Honeywell, Wendy S. Meschino, Joanne Permaul, June C. Carroll
Canadian Family Physician Mar 2010, 56 (3) 247;

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Genetics
Clare A. Gibbons, Judith Allanson, Sean M. Blaine, Carol Cremin, Heather Dorman, Christina Honeywell, Wendy S. Meschino, Joanne Permaul, June C. Carroll
Canadian Family Physician Mar 2010, 56 (3) 247;
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