评价胎儿包括胎儿体重和位置。对胎儿大小的估计，即使是超声学获得的结果经常都不准确。

Assessment of the fetus consists of estimating fetal weight and position. Estimations of fetal size, even those obtained by ultrasonography, are frequently inaccurate.

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目的：用超声和临床方法，四个公式估计胎儿体重，以比较其准确性。

Objective To determine the accuracy of various methods for estimating fetal weight at labor .

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