The Impact of the Active Stage of Labor on Estimate Fetal Weight: A Prospective Cohort Study

Objective: In the literature, there have been few data on ultrasound measurements during the active phase of labor. In this study, it was aimed to compare the accuracy of fetal weight estimation by ultrasound in terms of active phase of labor. Methods: This was a prospective cohort study at the obstetrics clinic of Esenler Gynecology and Children's Hospital in Istanbul. A total of 85 patients in active labor were included in the study. All pregnant women were evaluated for estimated fetal weight (EFW) by ultrasound evaluation, and cervical dilation and effacement measurements by pelvic examination, at most 24 hours before labor. Hadlock-4 formula was used for EFW. EFW and actual birth weight (ABW) and absolute errors of pregnant women in active labor were compared. Results: The mean EFW and ABW of the patients were 3161±482 and 3150±476 g, respectively. In terms of EFW and ABW, a finding in favor of the ultrasound was found. The error and error rates between EFW and ABW were found to be 234±191 g and 7.6±6.2, respectively. No significant difference was found in terms of these parameters (p>0.05). A significant and strong (0.80) correlation was found with estimated fetal weights and actual birth weights. Conclusion: Ultrasound can be used as a safe method to measure estimated fetal weight in the active phase of labor.

Keywords:

Estimated fetal weight, Ultrasound Active phase of labor,

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Warshafsky C, Ronzoni S, Quaglietta P, et al. Comparison of sonographic fetal weight estimation formulas in patients with preterm premature rupture of membranes. BMC Pregnancy and Childbirth. 2021;21(1):149.
Lanowski JS, Lanowski G, Schippert C, Drinkut K, Hillemanns P, Staboulidou I. Ultrasound versus Clinical Examination to Estimate Fetal Weight at Term. Geburtshilfe Frauenheilkd. 2017;77(3):276-283.
Milner J, Arezina J. The accuracy of ultrasound estimation of fetal weight in comparison to birth weight: A systematic review. Ultrasound. 2018;26(1):32-41.
Günay T, Ayaz Bilir R, Hocaoğlu M, Demirçivi Bör E, Turgut A. The Effect of Oligohydramnios on Estimated Fetal Weight Measurements in Term Pregnancies. Comprehensive Medicine. 2020;12(2):169-174.
Blitz MJ, Rochelson B, Stork LB, et al. Effect of Maternal Body Mass Index and Amniotic Fluid Index on the Accuracy of Sonographic Estimation of Fetal Weight in Late Gestation. Am J Perinatol. 2018;35(13):1235-1240.
Karahanoglu E, Altinboga O, Akpinar F, et al. The Effect of the Amniotic Fluid Index on the Accuracy of Ultrasonographic-Estimated Fetal Weight. Ultrasound Quarterly. 2017;33(2).
Hiwale S, Firtion C. Analysis of factors influencing accuracy of ultrasound-based fetal weight estimation. Indian J Radiol Imaging. 2020;30(2):156-162.
Dittkrist L, Vetterlein J, Henrich W, et al. Percent error of ultrasound examination to estimate fetal weight at term in different categories of birth weight with focus on maternal diabetes and obesity. BMC Pregnancy and Childbirth. 2022;22(1):241.
Weiner E, Mizrachi Y, Fainstein N, et al. Comparison between Three Methods of Fetal Weight Estimation during the Active Stage of Labor Performed by Residents: A Prospective Cohort Study. Fetal Diagn Ther. 2017;42(2):117-123.
Barros JG, Reis I, Pereira I, Clode N, Graça LM. Estimation of Fetal Weight during Labor: Still a Challenge. Revista Brasileira de Ginecologia e Obstetrícia. 2016;38.
Blann DW, Prien SD. Estimation of fetal weight before and after amniotomy in the laboring gravid woman. Am J Obstet Gynecol. 2000;182(5):1117-1120.