Aim Of The Study: Biochemical diagnosis of fetuses with multiple malformations--an attempt to determine the frequency of prenatal Smith-Lemli-Opitz syndrome. Discussion on trends in prenatal diagnosis of non-specific multiple malformations disorders.
Material And Methods: A total of 117 fetal samples were obtained. They were analyzed with gas chromatography/mass spectrometry (GC/MS) method to assess the concentration of 7-dehydrocholesterol (7DHC) and 8-dehydrocholesterol (8DHC) in amniotic fluid samples and (or) to establish 7-dehydroestriol/estriol and 8-dehydropregnanetriol/pregnanetrio ratios in maternal urine.
Results: In 4 cases Smith-Lemll-Opitz syndrome was confirmed.
Conclusions: Biochemical GC/MS sterol analyses of amniotic fluid or maternal urinary metabolites toward Smith- Lemli-Opitz syndrome, as cheap tests, should be performed in all pregnancies with suggestive ultrasound features (holoprosencephaly and(or) atrioventricular canal and(or) genital anomalies), especially when nuchal translucency is increased >3 mm, and after exclusion of chromosomal aberration in routine karyotyping or even arrayCGH.
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