Original ResearchHow Well Do the Popular Ultrasonic Techniques Estimate Amniotic Fluid Volume and Diagnose Oligohydramnios, in Fact?Madendag, Yusuf MD*; Madendag, Ilknur Col MD†; Sahin, Erdem MD‡; Aydin, Emine MD§; Sahin, Mefkure Eraslan MD‡; Acmaz, Gokhan MD*Author Information *Department of Obstetrics and Gynecology, Erciyes University Faculty of Medicine; and †Obstetrics and Gynecology, Health Sciences University Kayseri Education and Research Hospital, Kayseri; ‡Obstetrics and Gynecology, Health Sciences University Sivas Sarkisla Government Hospital, Sivas; and §Perinatology, Health Sciences University Kayseri Education and Research Hospital, Kayseri, Turkey. Received for publication July 7, 2018; accepted October 1, 2018. This study was conducted in the Department of Obstetrics and Gynecology, Health Sciences University Kayseri Education and Research Hospital, Kayseri, Turkey. All procedures performed in the survey involving human participants were in accordance with the ethical standards of institutional and national research committee. This article does not contain any studies with animals performed by any of the authors. Informed consent was obtained from all individual participants included in the survey. Authors' Contributions: Y.M.: project development, data collection, and manuscript writing; E.A.: data collection and management; I.C.M., M.E.S.: data collection and analysis; E.S. and G.A.: data collection and manuscript editing. There was no funding for the study. The authors declare no conflict of interest. Address correspondence to: Yusuf Madendag, MD, Mustafa Kemal Pasa Av, Bulvari Kocasinan, Kayseri, Turkey 38090 (e-mail: firstname.lastname@example.org). Ultrasound Quarterly: March 2019 - Volume 35 - Issue 1 - p 35-38 doi: 10.1097/RUQ.0000000000000408 Buy Metrics Abstract The aims of the study were to compare the different estimation methods for the diagnosis of oligohydramnios and to determine concordance between estimated amniotic fluid volume (AFV) measured by ultrasonography and actual AFV measured directly. Another purpose was to investigate the effect of oligohydramnios on neonatal outcome. This study was done at a tertiary care center. The participants were scheduled between 37 and 40 weeks for cesarean delivery. Estimated AFV was ultrasonographically assessed, and then actual AFV was directly measured during the cesarean delivery to compare the subjective method (SM), amniotic fluid index (AFI), single deepest pocket (SDP), and 2-diameter pocket. Totally, 138 patients were included in the present study. Of 35 (34%), 24 (21%), 12 (9.5%), and 10 (7.8%) were defined as oligohydramnios by the SM, AFI, SDP, and 2-diameter pocket, respectively. The number of patients with actual oligohydramnios was 35 (34%). Most authors suggest as a method use of the SDP more than the AFI, because of overmanagement through the AFI. However, this study, which was conducted using both nonprejudiced and criterion-standard methods, showed that the SM and AFI technique were more successful to estimate oligohydramnios than other methods. Also, adverse pregnancy outcome was not closely associated with isolated oligohydramnios. Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.