Mul T, Mongelli M, Gardosi J
Department of Obstetrics and Gynaecology, University Hospital, Queen's Medical Centre, Nottingham, UK.
Ultrasound Obstet Gynecol. 1996 Dec;8(6):397-402. doi: 10.1046/j.1469-0705.1997.08060397.x.
A dataset of 64 pregnancies conceived by artificial reproductive techniques was studied to assess the accuracy of second-trimester dating formulae when these were applied in routine ultrasound clinics in different centers. Dating formulae for biparietal diameter (BPD) and femur length (FL) were derived for a gestational age range of 14-23 weeks. The best fit curves represented linear equations: gestational age (days) = 44.2 + 2 x BPD; and gestational age (days) = 67.4 + 2.3 x FL. Twelve published formulae for biparietal diameter and femur length were reviewed and systematic and random errors were calculated for these formulae when they were applied to second-trimester scan measurements in precisely dated pregnancies. Overall, published dating formulae performed well in predicting gestational age. The 95% confidence interval was 8.3 days for biparietal diameter and 10.2 days for femur length. The study confirms the accuracy of ultrasound dating in routine ultrasound clinics and supports the use of ultrasound measurement alone in preference to menstrual history for dating pregnancy.
对一组通过人工生殖技术受孕的64例妊娠数据进行了研究，以评估孕中期预产期公式应用于不同中心的常规超声检查时的准确性。得出了孕14 - 23周胎头双顶径（BPD）和股骨长度（FL）的预产期公式。最佳拟合曲线为线性方程：孕周（天）= 44.2 + 2×BPD；孕周（天）= 67.4 + 2.3×FL。回顾了12个已发表的关于胎头双顶径和股骨长度的公式，并计算了将这些公式应用于精确记录孕周的妊娠的孕中期扫描测量时的系统误差和随机误差。总体而言，已发表的预产期公式在预测孕周方面表现良好。胎头双顶径的95%置信区间为8.3天，股骨长度为10.2天。该研究证实了常规超声检查中超声预产期的准确性，并支持在确定妊娠孕周时优先单独使用超声测量而非月经史。
