Lafont M, Dellinger P, Mutumba W, Bernard C, Hoyek T
Maternité du centre hospitalier d'Auxerre, 2, boulevard de Verdun, 89011 Auxerre, France.
Maternité du centre hospitalier d'Auxerre, 2, boulevard de Verdun, 89011 Auxerre, France.
Gynecol Obstet Fertil. 2016 Jul-Aug;44(7-8):391-5. doi: 10.1016/j.gyobfe.2016.05.005. Epub 2016 Jul 15.
Our aim was to evaluate the accuracy of estimated fetal weight (EFW) by ultrasound at due date and the factors that could affect it.
We performed a retrospective study of 233 patients in 2014. An ultrasound was performed at due date consultation around 41 weeks of amenorrhea by midwives sonographer. EFW was calculated using the Hadlock's formula with 3 parameters (biparietal diameter, abdominal circumference and femur length) and then adjusted including the growth from the due date consultation to the day of delivery (25g/day) and finally compared to birth weight (BW).
The mean absolute weight difference between EFW adjusted and BW was 256g [0; 910]. The mean absolute percentage error was 7.2 % [0; 24.5] and the proportion of the EFW adjusted within 10 % of BW was 69.1 %. There was a strong correlation between EFW adjusted and BW (R=0.79). Obesity in early pregnancy or childbirth, excessive weight gain, the presence of oligoanamnios and fetal macrosomia had no influence on the estimated fetal weight. Indeed, the mean absolute percentage error of child who were macrosome and those were not, was similars (7.9 % vs 7.1 %, P=0.407).
EFW by ultrasound at due date is performant. However, the adjustment by the effect growth does not improve accuracy. Fetal macrosomia do not decrease the accuracy of ultrasound to estimate the fetal weight at term.
我们的目的是评估预产期超声估计胎儿体重（EFW）的准确性以及可能影响该准确性的因素。
我们对2014年的233例患者进行了一项回顾性研究。在停经约41周的预产期会诊时，由助产士超声医师进行超声检查。使用包含三个参数（双顶径、腹围和股骨长度）的哈德洛克公式计算EFW，然后根据从预产期会诊到分娩日的生长情况（每天25克）进行调整，最后与出生体重（BW）进行比较。
调整后的EFW与BW之间的平均绝对体重差异为256克[0；910]。平均绝对百分比误差为7.2%[0；24.5]，调整后的EFW在BW的10%范围内的比例为69.1%。调整后的EFW与BW之间存在很强的相关性（R = 0.79）。孕早期肥胖或分娩时肥胖、体重过度增加、羊水过少和巨大儿对估计胎儿体重均无影响。实际上，巨大儿和非巨大儿的平均绝对百分比误差相似（7.9%对7.1%，P = 0.407）。
预产期超声测量EFW效果良好。然而，根据生长效应进行调整并不能提高准确性。巨大儿不会降低超声在足月时估计胎儿体重的准确性。
