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CC BY-NC-ND 4.0 · Indian J Radiol Imaging 2020; 30(02): 156-162
DOI: 10.4103/ijri.IJRI_167_19
Fetal Imaging

Analysis of factors influencing accuracy of ultrasound-based fetal weight estimation

Sujitkumar Hiwale
Philips Research India, Philips Innovation Campus, Nagavara, Bengaluru, Karnataka, India
,
Celine Firtion
Philips Research India, Philips Innovation Campus, Nagavara, Bengaluru, Karnataka, India
› Author Affiliations Financial support and sponsorship Nil.
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Abstract

Context: The primary objective of this study was to examine the impact of maternal age, parity, gestational age, fetal gender, gestational diabetes mellitus, and pregnancy-induced hypertension on the accuracy of ultrasonography-based fetal weight estimation. The secondary objective was to find the impact of a formula selection on the accuracy of fetal weight estimation. Subjects and Methods: The inclusion criteria were a live-birth singleton pregnancy and the last ultrasound scan to delivery interval ≤7 days. Fetal weight was estimated using the Hadlock-4 formula. To study the concurrent impact of all the factors on the accuracy, cases were divided into two subcategories based on percentage error, with ±10% as a threshold. The accuracy of Hadlock-4 formula was compared with the two Indian population-based formulas, Hiwale-1 and Hiwale-2. Results: In total, 184 cases were included in the study. It was observed that the systematic error in weight estimation was significantly less in the male fetuses (8.45 ± 9.34%) in comparison to the female fetuses (11.71 ± 10.34%). The combined impact of all the factors on the accuracy was found to be nonsignificant by the multivariate analysis. The Hiwale-1 (-0.59 ± 8.75%) and Hiwale-2 (-0.65 ± 8.7%) formulas had statistically significant less errors compared to the Hadlock-4 formula (11.67 ± 7.95%). Conclusion: All the studied clinical factors were found to have a limited impact on the overall accuracy of fetal weight estimation. However, the formula selection was found to have a significant impact on the accuracy, with the native population-based formulas being significantly more accurate.

Keywords

Factors affecting accuracy - fetal ultrasonography - fetal weight - India - multivariate analysis


Publication History

Received: 07 April 2019

Accepted: 20 February 2020

Article published online:
19 July 2021

© 2020. Indian Radiological Association. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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