This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/pd.5261 This article is protected by copyright. All rights reserved. Measurement of fetal atrioventricular time intervals: a comparison of three spectral Doppler techniques Sanitra Anuwutnavin 1 , Kamonwan Kolakarnprasert 2 , Pharuhas Chanprapaph 1 , Mark Sklansky 3 , Nadda Mongkolchat 1 1 Division of Maternal-Fetal-Medicine, Department of Obstetrics and Gynecology, Faculty of Medicine Siriraj Hospital, Mahidol University, Thailand 2 Department of Obstetrics and Gynecology, Nopparat Rajathanee Hospital, Thailand 3 Division of Pediatric Cardiology, Department of Pediatrics, David Geffen School of Medicine at UCLA, California, USA Correspondence to Sanitra Anuwutnavin, MD Division of Maternal-Fetal-Medicine, Department of Obstetrics and Gynecology, Faculty of Medicine Siriraj Hospital, Mahidol University 2 Prannok Road, Bangkoknoi, Bangkok, Thailand 10700 Tel: 011 662 419 7000 Fax: 011 662 418 2662 Email: asanitra@hotmail.com Running head: fetal atrioventricular time intervals Manuscript category: Original Research