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Evaluation methods for fetal trisomies during pregnancy


The possibilities of non-invasive or invasive testing do exist in principle before birth.
Non-invasive methods are ultrasound examinations and blood tests. They do not interfere with the body of the woman (except the blood sampling) and thus are gentler. The nuchal translucency screening, for example, in the course of the first trimester screening (12th to 14th week of pregnancy) is one of the most frequently carried out ultrasound examinations of the unborn child. Using these previous non-invasive methods, your individual risk that your child will carry trisomy 21, 18 and 13 for example can be determined. A definitive diagnosis, however, cannot be provided by these non-invasive methods.

Invasive methods mean an intervention on the body of the pregnant woman. Amniocenteses or puncture of the placenta are such examples. Both methods make it possible to collect cells from the unborn child to carry out a chromosomal analysis. The number, shape and structure of the chromosomes are analysed in this process and thus a definitive diagnosis can be made about the existence or exclusion of trisomy 13, 18 or 21 for example. The risk of losing the child due to this invasive procedure is specified at approximately 0.2–1%.

The PrenaTest®, as a novel non-invasive method, offers the possibility of detecting the most frequent forms of the trisomies 13, 18 and 21, the so-called “standard trisomies” in the unborn child with an accuracy of more than 98%. Blood is taken from a maternal vein for this purpose, a harmless procedure for your unborn child.
 
 
 
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