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The New Methods for the Prenatal Diagnosis of Down syndrome

الطرائق الحديثة في تشخيص متلازمة داون (تثلث الصبغي21) قبل الولادة

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 Publication date 2005
and research's language is العربية
 Created by Shamra Editor




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The aim of the present research is to determine the appropriate diagnostic methods to find out the affected fetuses with Down Syndrome in order to decrease as possible subjecting the pregnant women to invasive prenatal diagnosis . This is a Prospective – practical study, where /1137/ pregnant women at 13- 16 gestation weeks, ( age range: 20-42 years) were included. Biochemical screening of the pregnant women, ultrasound screening of the fetuses: nuchal translucency, nasal bone, which helped us to isolate the highrisk pregnancies for Down syndrome (the potential rate of incidence ≥ 0.4%). The screen positive group included 57 pregnant ( 5.01% ) . Amniocentesis and subsequently karyotyping was done to each woman in this group . We found out 4 affected fetuses from 5 ( 80%) , because the following up of the remaining pregnancies revealed a fifth affected newborn with Down syndrome. The early prenatal diagnosis of Down syndrome was possible in ( 80% ) by subjecting only ( 5.01% ) of pregnants to the invasive prenatal diagnosis .

References used
Nicolaides K.H. Screening for chromosomal defects. Ultrasound Obstet Gynecol 2003 ; 21:313-321
Simona Cicero, et. al . Absence of nasal bone in fetuses with trisomy 21 at 11-14 weeks of gestation : An observational study . The lancet .2001 vol 358 . 1665-1667
Jorde Lynn B., et.al . Genetic testing and gene therapy . Medical genetics .Elsevier Mosby 3rd edition . USA , 2003, 278-305
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