Göttlicher S, Madjarić J, Krone H A
Geburtshilfe Frauenheilkd. 1977 Sep;37(9):762-7.
The growth of the fetal biparietal diameter (BPD) of twins is compared with the BPD of the normal pregnancy during gestation. Until 26th week of gestation the growth curves of both groups are nearly identic. From the 28th week onwards the growth of the twins' BPD is remarkably less than in normal pregnancies. The difference in the 40th week is about 10 mm, it is statistically highly significant. In pregnancies of unknown duration the BPD should be measured early, i.e. before 28th-30th week with a control 4 weeks later. No twin pregnancy lasted until the 280th day post menstruationem. So in twin pregnancies the day of delivery should be determined to an earlier date, i.e. ca the 27th day post menstruationem.
将双胞胎胎儿双顶径（BPD）的生长情况与孕期正常妊娠的BPD进行比较。在妊娠26周之前，两组的生长曲线几乎相同。从第28周起，双胞胎BPD的生长明显低于正常妊娠。第40周时的差异约为10毫米，具有高度统计学意义。对于妊娠时长未知的孕妇，应尽早测量BPD，即在第28 - 30周之前测量，并在4周后进行复查。没有双胞胎妊娠持续到月经后第280天。因此，对于双胞胎妊娠，分娩日期应确定得更早，即大约在月经后第270天。
