ObjectiveTo explore the accuracy and application value of ultrasonographic examination after bladder filling in evaluating fetal weight during postpregnancy.

MethodsOne hundred and eight normal head position single fetal maternal were examined using 2D ultrasound in bladder filling and unfilling within 1 week before delivery, the fetal growth parameters were observed, and the estimation fetal weight (EFW) was measured using the Hadlock formula.

ResultsThe standard shear rates of fetal double top diameter and head circumference at bladder filling and unfilling were 91/108 and 68/108, respectively, and the difference of which was statistically significant (P < 0.01).The differences of the fetal head circumference and body weight in puerperal with bladder unfilling between fetus and actual birth were statistically significant (P < 0.01), and the differences of the fetal head circumference and body weight in puerperal with bladder filling between fetus and actual birth were not statistcially significant (P>0.05).The fetal head circumference and body weight in puerperal with bladder unfilling were significantly lower than those in puerperal with bladder filling and actual birth (P < 0.01).

ConclusionsThe 2D ultrasonographic examination in puerperal with bladder filling can effectively improve the accuracy of the standard section of fetal double top diameter and head circumference, the fetal body quality estimated is closer to the actual quality of birth, which can provide the help in clinicians to judge and estimate fetal body weight.