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Prenatal Test and Miscarriage

According to the findings of a UCSF study to be published in the September 2006 issue of the journal "Obstetrics and Gynecology," the risk of miscarriage in pregnant women seeking prenatal diagnostic test to identify genetic // or chromosomal abnormalities is lower than previously believed.

Two standard tests--amniocentesis and chorionic villus sampling (CVS)--are common prenatal tests performed during the first and second trimester of pregnancy. Early testing using the CVS procedure has typically been thought to have a higher rate of miscarriage than amniocentesis. However, in a 20-year retrospective comparison study of the two procedures, researchers found that the loss rates for both procedures decreased over time.

"This is a significant finding for use as information in both patient counseling and in establishing widespread prenatal diagnostic and screening programs," said study co-author Mary E. Norton, MD, who is medical director of the Prenatal Diagnostic Center at UCSF Medical Center and associate clinical professor in the UCSF Department of Obstetrics, Gynecology and Reproductive Sciences.

Both amniocentesis and CVS are invasive diagnostic screening methods that carry a small risk of pregnancy loss. Amniocentesis requires insertion of a hollow needle through the abdominal wall and into the uterus to withdraw amniotic fluid. CVS is a biopsy procedure that involves removing a piece of tissue from the placenta. These samples are then cultured and chromosomes analyzed to determine abnormalities associated with Down syndrome and other genetic diseases such as cystic fibrosis, Tay-Sachs disease, and sickle cell disease.

CVS can be performed at an earlier gestation period (10-12 weeks) than amniocentesis (16-20 weeks), and therefore is preferred by some patients because of earlier detection of possible abnormalities, according to Norton.

The study looked at data from 9,886 CVS and 30,893 amniocentesis proce
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