Accessible Unlicensed Requires Authentication Published by De Gruyter May 29, 2019

Comparison of automated vs. manual measurement to estimate fetal weight in isolated polyhydramnios

Hasan Eroglu, Gokcen Orgul, Emine Avcı, Orhan Altınboga, Gokhan Karakoc and Aykan Yucel



To understand the impact of the measurement method to predict actual birthweight in pregnancies complicated with isolated polyhydramnios in the third trimester.


A prospective study was conducted with 60 pregnant women between the 37th and 40th weeks of gestation. Routine biometric measurements were obtained by two-dimensional (2D) ultrasonography. When a satisfactory image was obtained, the image was frozen to get two measurements. First, calipers were placed to get the manual measurement. Then automated measurement was captured by the ultrasonography machine in the same image. The fetal weight was estimated by using the Hadlock II formula.


The mean difference was found to be 0.03, −0.77, −0.02 and 0.17 for biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC) and femur length (FL), respectively. Pearson’s correlation coefficient between automated and manual estimated fetal weights (EFWs) and the actual birthweight was 0.919 and 0.796, respectively. The mean difference between actual and manual EFW measurement values was 46.16 ± 363.81 g (range between −745 g and 685 g) (P = 0.330). Also, the mean difference between actual and automated EFW measurement values was found to be 31.98 ± 218.65 g (range between −378 g and 742 g) (P = 0.262). The Bland-Altman test results have shown that, 666 g lower or 759 g higher values were obtained when the measurement was performed manually. On the other hand, EFW results were 396 g lower or 460 g higher than the actual birthweight with automated measurement tools.


The accuracy rate of fetal weight estimation with ultrasonography is high for both automated and manual measurements. Automated tools have a higher success to predict the EFW.

Corresponding author: Gokcen Orgul, MD, Department of Perinatology, Etlik Zubeyde Hanim Women’s Health Care, Training and Research Hospital, University of Health Sciences, 06050 Yenimahalle, Ankara, Turkey, Tel.: +90 555 606 62 54

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

  5. Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.


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Supplementary Material

The online version of this article offers supplementary material (

Received: 2019-03-12
Accepted: 2019-04-22
Published Online: 2019-05-29
Published in Print: 2019-08-27

©2019 Walter de Gruyter GmbH, Berlin/Boston