Simon N V, Levisky J S, Siegle J C, Shearer D M
J Clin Ultrasound. 1984 May;12(4):195-9. doi: 10.1002/jcu.1870120405.
We compared the actual delivery dates of 248 normal pregnant women to the estimated dates of confinement (EDC) calculated from one biparietal diameter measurement (BPD) between 18 and 26 weeks of gestation and to the EDCs corrected by the growth adjusted sonographic age ( GASA ) method. The dating of gestation by those two ultrasound methods also was compared to the calculation of the gestational age from the last menstrual period in a subgroup of 61 women with highly reliable clinical data. The GASA method had no advantage over the dating of gestation using one single BPD measurement obtained before 26 weeks, nor over the dating of gestation using reliable menstrual data.
我们将248名正常孕妇的实际分娩日期与根据妊娠18至26周期间单次双顶径测量（BPD）计算出的预产期（EDC）进行了比较，并与通过生长调整超声孕周（GASA）方法校正后的EDC进行了比较。在一个具有高度可靠临床数据的61名女性亚组中，还将这两种超声方法确定的孕周与根据末次月经计算的孕周进行了比较。GASA方法相对于使用26周前获得的单次BPD测量确定孕周，以及相对于使用可靠月经数据确定孕周而言，均无优势。
