During that can detect Down syndrome in unborn baby is by ultrasound (ultrasonography) 4 dimensions. But scientists say that during pregnancy the mother's blood test is more accurate and safer to predict Down syndrome in unborn baby.
Down syndrome is a condition of physical and mental growth retardation of children resulting from the development of chromosomal abnormalities and genetic disorders.

Down syndrome cognitive delays caused because the baby has an additional copy of chromosome 21.
In infants in the womb, Down syndrome can be detected with this during non-invasive test that is 4D ultrasound.
There is also a prenatal test by inserting a needle into the womb to sample amniotic fluid, amniocentesis or placental tissue for chorionic villus sampling or CVS.
Although these invasive tests are more accurate, but has a risk of miscarriage ranges from 0.01 percent to 0.5 percent for amniocentesis and 1 percent for CVS, according to guidelines posted on the site 2007 that Mount Sinai Hospital.
But now women are offered blood tests to find differences between himself and fetal DNA, with 80 percent accuracy. And there is no risk of spontaneous abortion with this test.
According to a small study published in the journal Nature Medicine on Monday (7/3/2011), scientists in Cyprus, Greece and Britain said that the blood test to detect blindness in infants, they identified a risk of fetal Down syndrome in 14 cases .
"We believe we can modify this test and make it easier and simpler," said Philippos Patsalis, medical director of the Cyprus Institute of Neurology and Genetics in Nicosia, as reported by CBC, Tuesday (08/03/2011).
Researchers said the test was given this name Patsalis expected to be introduced into clinical practice within the next two years.
Patsalis method can directly detect Down's syndrome, also called trisomy 21, by taking a small amount of blood from the mother between the ages of 11 and 13 weeks of pregnancy. This test works by measuring the differences in DNA patterns between mother and fetus.
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