Screening for trisomy 21 in twin pregnancies in the first trimester:: does chorionicity impact on maternal serum free β-hCG or PAPP-A levels?

被引：31

作者：

Spencer, K ^{[1
]}

机构：

[1] Harold Wood Hosp, Endocrine Unit, Dept Clin Biochem, Romford RM3 0BE, Essex, England

来源：

PRENATAL DIAGNOSIS | 2001年 / 21卷 / 09期

关键词：

NT; PAPP-A; free beta-hCG; prenatal screening; first trimester; twins; Down syndrome;

D O I：

10.1002/pd.152

中图分类号：

Q3 [遗传学];

学科分类号：

071007 ; 090102 ;

摘要：

In a study of 180 twin pregnancies I have examined the distribution of maternal serum free beta -human chorionic gonadotrophin (beta -hCG) and pregnancy-associated plasma protein-A (PAPP-A), in addition to fetal nuchal translucency thickness (NT), in twins classified as monochorionic or dichorionic, based on ultrasound appearance at 10-14 weeks of gestation. In 45 monochorionic and 135 dichorionic twin pregnancies the median MoM free beta -hCG was not significantly different (1.00 vs 1.01), whilst that for PAPP-A was lower (0.89 vs 1.01) but again with no statistical significance. Previous reports of an increased fetal NT in monochorionic twins pregnancies could not be confirmed (1.03 vs 1.00). It is concluded that the existing pseudo risk twin correction algorithm is appropriate for both monochorionic and dichorionic twins in providing accurate first trimester risks for trisomy 21. Copyright (C) 2001 John Wiley & Sons, Ltd.

引用

页码：715 / 717

页数：3

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