Not all tests for Down syndrome are just as reliable and have the same risk for the mother and baby. Some only require a blood test to detect this genetic abnormality, while others are more aggressive. If a woman decides on its own initiative or on medical advice to undergo any tests to diagnose Down syndrome should always consider your safety and your baby.
What is it and how Down syndrome is detected?
Down syndrome, also known as trilogy 21, it is one of the most common genetic abnormalities. It affects one in 100,000 children, although the symptoms of Down syndrome vary in each case , those who suffer manifest greater or lesser degree, mental retardation and growth, low muscle tone and increased risk of heart disease, respiratory and stomach. It is advisable for women over 35 years with a family history or previous pregnancies with genetic abnormalities are subject to any of the different tests to diagnose Down syndrome during pregnancy.
What are the tests for Down syndrome?
There are two types of tests for Down’s syndrome: the screening tests and predictive, which offer a percentage lower reliability. The triple screening and nuchal translucency test to detect Down syndrome belong to the second group while amniocentesis and prenatal invasive test would not be the first.
Tripe screening and nuchal translucency
Both are simple and non invasive, so neither the mother nor the fetus suffers pain or trauma. The first is a combination of different blood tests to detect Down syndrome in which biochemical and hormonal measured in maternal blood and placenta values. The second is similar to an ultrasound ultrasound in which the specialist measures the nuchal translucency thickness baby whose size is indicative of whether a baby has Down syndrome. As neither the Triple Screening test nor uncial translucency provide definitive result if they risk percentage is detected mother must undergo other tests to detect Down syndrome.
It involves removing a sample of amniotic fluid is analyzed to see if there are genetic abnormalities in the fetus. Amniocentesis is one of the tests for Down syndrome more reliable, but also presents the most risk as it is performed through a puncture into the uterus. To be more invasive, during amniocentesis mother may suffer abdominal pain, bleeding, loss of amniotic fluid and in some cases can even cause an abortion.
Noninvasive Prenatal Test
The prenatal noninvasive test is a blood test to detect Down syndrome and other chromosomal abnormalities. Baby certain genetic information flows through the bloodstream of the mother, so similar to a peripheral extraction routine analysis is sufficient to obtain a valid sample. The prenatal invasive test is not completely safe and has a very high reliability. In addition it is from the 10th week of gestation, so the mother can face the second quarter with greater confidence.