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Noninvasive Test May Identify Down Syndrome Early On
Date:3/7/2011

By Steven Reinberg
HealthDay Reporter

SUNDAY, March 6 (HealthDay News) -- A simple blood test may one day offer a safe way to detect Down syndrome during pregnancy, researchers say.

In a small study, an experimental blood test identified a gene mutation associated with Down syndrome with 100 percent accuracy, according to the Cyprus scientists.

"Down syndrome is a common birth defect, with one Down syndrome birth in every 600 births in all populations," said lead researcher Philippos Patsalis, chief executive medical director of the Cyprus Institute of Neurology and Genetics in Nicosia. "This is due to an extra chromosome 21, and that leads to physical and mental impairment."

"With our method we identify all normal and all Down syndrome [pregnancies]," Patsalis said.

Currently, Down syndrome is diagnosed using one of two invasive procedures, amniocentesis or chorionic villus sampling. Because these tests, while 80 percent accurate, carry a 1 percent to 2 percent risk of miscarriage, only about one in 10 pregnant women opts for them, he said.

The new test eliminates the risk of miscarriage, Patsalis said.

It also can identify Down syndrome in the 11th week of pregnancy, early enough for a woman to end her pregnancy if she chooses, Patsalis said.

Although Down syndrome varies in severity, it usually causes some intellectual impairment and distinguishing facial features. Heart defects and other health problems are also common, according to the March of Dimes. Older mothers are more likely to give birth to Down syndrome babies.

People with Down syndrome, also known as Trisomy 21, carry three copies of chromosome 21, instead of two.

For the study, published online March 6 in Nature Medicine, Patsalis and his colleagues took blood samples from pregnant women and mothers of Down syndrome and healthy babies. In each case, the test quickly pinpointed the chromosomal variatio
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