Chien P F, Owen P, Khan K S
Department of Obstetrics and Gynaecology, Ninewells Hospital and Medical School, Dunde, United Kingdom.
Obstet Gynecol. 2000 Jun;95(6 Pt 1):856-60. doi: 10.1016/s0029-7844(00)00828-0.
To assess the validity of ultrasound estimation of fetal weight at term.
We conducted a prospective observational study whereby all ultrasonic biometric measurements were done by a single observer. Fifty pregnant women at term had ultrasonic measurement of various fetal biometric parameters performed within a week of delivery. Fetal weight was estimated by the use of four reported methods (Aoki, Campbell, Shepard, and Hadlock formulas). We compared estimated weight with the birth weight after the estimated fetal weight was adjusted by adding 25 g for each day between the ultrasound measurements and delivery.
The adjusted estimated fetal weight obtained from all four formulas tended to be lower than measured birth weight. The smallest mean difference was obtained with the Shepard and Aoki formulas (51.4 g and 60.5 g, respectively), whereas the Campbell and Hadlock formulas produced larger mean differences (141.8 g and 190.7 g, respectively). The Aoki formula generated the smallest range between the limits of agreement (-324.2 to 445.2 g) whereas the Campbell formula produced the largest range (-286.5 to 570.1 g). The range between the limits of agreement generated with the Shepard and Hadlock formulas were intermediate between those produced by the Aoki and Campbell formulas. The intraclass correlation coefficients generated with the Aoki and Shepard formulas were identical (0.90). The intraclass correlation coefficients obtained with the Hadlock (0.84) and Campbell formulas (0.85) were lower.
The validity of ultrasonic estimation of fetal weight at term with all four formulas was high.
评估足月胎儿体重超声估计的有效性。
我们进行了一项前瞻性观察性研究，所有超声生物测量均由一名观察者完成。50名足月孕妇在分娩前一周内进行了各种胎儿生物测量参数的超声测量。使用四种报告的方法（青木、坎贝尔、谢泼德和哈德洛克公式）估计胎儿体重。在将超声测量与分娩之间的天数乘以25克后加到估计胎儿体重上进行调整后，我们将估计体重与出生体重进行了比较。
从所有四个公式获得的调整后的估计胎儿体重往往低于测量的出生体重。谢泼德公式和青木公式的平均差异最小（分别为51.4克和60.5克），而坎贝尔公式和哈德洛克公式的平均差异较大（分别为141.8克和190.7克）。青木公式产生的一致性界限范围最小（-324.2至445.2克），而坎贝尔公式产生的范围最大（-286.5至570.1克）。谢泼德公式和哈德洛克公式产生的一致性界限范围介于青木公式和坎贝尔公式之间。青木公式和谢泼德公式产生的组内相关系数相同（0.90）。哈德洛克公式（0.84）和坎贝尔公式（0.85）获得的组内相关系数较低。
使用所有四个公式对足月胎儿体重进行超声估计的有效性较高。
