Tunón K, Eik-Nes S H, Grøttum P
National Center for Fetal Medicine, Department of Obstetrics and Gynecology, Trondheim University Hospital, Norway.
Ultrasound Obstet Gynecol. 1996 Sep;8(3):178-85. doi: 10.1046/j.1469-0705.1996.08030178.x.
In a non-selected population comprising 15,241 women, an evaluation was performed of the ultrasonic measurement of the biparietal diameter compared with a reliable last menstrual period as the basis for estimation of the day of delivery. In women with a reliable menstrual history and spontaneous onset of labor, the ultrasound estimate was the significantly better predictor of the day of delivery in 52% of cases, and the last menstrual period estimate was the better predictor in 46% of cases. The percentages of women who delivered within 7 days of the predicted day were 61 and 56% for the ultrasound and the last menstrual period estimations, respectively. There was a significantly narrower distribution of births according to the ultrasound estimate (p < 0.001). The proportion of estimated postterm births was 4% using the ultrasound method and 10% using the last menstrual period method (p < 0.001). Even when the difference between the methods in predicting the day of delivery was less than 7 days, the ultrasound method was better than the last menstrual period method. It is concluded that ultrasonic measurement of the biparietal diameter between 15 and 22 weeks of pregnancy is the best method for the estimation of the day of delivery and should be used as a routine procedure.
在一个由15241名女性组成的非选择性人群中，对双顶径的超声测量结果与可靠的末次月经日期进行了评估，以此作为估计分娩日期的依据。在有可靠月经史且自然发动分娩的女性中，超声估计在52%的病例中是分娩日期的显著更好预测指标，末次月经日期估计在46%的病例中是更好的预测指标。超声和末次月经日期估计中，在预测日期的7天内分娩的女性比例分别为61%和56%。根据超声估计，出生分布明显更窄（p<0.001）。使用超声方法估计过期产的比例为4%，使用末次月经日期方法为10%（p<0.001）。即使两种方法在预测分娩日期上的差异小于7天，超声方法也优于末次月经日期方法。结论是，妊娠15至22周时双顶径的超声测量是估计分娩日期的最佳方法，应作为常规程序使用。
