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使用B超与末次月经(LMP)确定孕龄将使Down综合征(DS)的生物化学筛查率提高到9％,但事实上DS与正常妊娠在头臀距(CRL)没有差别。12周内B超根据CRL确定孕龄,而后则根据双顶径(BPD)确定。孕早期(3个月内)的生物化学筛查重要性是确定DS与其它的非倍体妊娠CRL的相关性。本研究比较了用月经史确定孕龄并由此推知孕早期的CRL来筛查非倍体。筛查是在孕妇
Determining gestational age using B-ultrasound and the last menstruation (LMP) will raise the biochemical screening rate for Down Syndrome (DS) to 9%, but in fact there is no difference in head-to-hip distance (CRL) between DS and normal pregnancy. B-week 12 weeks according to the CRL to determine gestational age, and then according to biparietal diameter (BPD) to determine. The importance of biochemical screening during early pregnancy (within 3 months) is to determine the association of DS with CRL in other nonploidy pregnancies. This study compared the use of menstrual history to determine gestational age and thus infer the early pregnancy CRL to screen for non-ploidy. Screening is in pregnant women