SOGC CLINICAL PRACTICE GUIDELINE JUNE JOGC JUIN 2011 l 643 Ultrasound in Twin Pregnancies No. 260, June 2011 This document reflects emerging clinical and scientific advances on the date issued and is subject to change. The information should not be construed as dictating an exclusive course of treatment or procedure to be followed. Local institutions can dictate amendments to these opinions. They should be well documented if modified at the local level. None of these contents may be reproduced in any form without prior written permission of the SOGC. This Clinical Practice Guideline has been prepared by the Diagnostic Imaging Committee, reviewed by the Genetics Committee and the Maternal Fetal Medicine Committee, and approved by the Executive and Council of the Society of Obstetricians and Gynaecologists of Canada. PRINCIPAL AUTHORS Lucie Morin, MD, Outremont QC Kenneth Lim, MD, Vancouver BC DIAGNOSTIC IMAGING COMMITTEE Lucie Morin, MD (Chair), Outremont QC Kenneth Lim, MD (Co-Chair), Vancouver BC Stephen Bly, MD, Ottawa ON Kimberly Butt, MD, Fredericton NB Yvonne M. Cargill, MD, Ottawa ON Gregory Davies, MD, Kingston ON Nanette Denis, CRGS, Saskatoon SK Robert Gagnon, MD, Montreal QC Marja Anne Hietala-Coyle, RN, Halifax NS Annie Ouellet, MD, Sherbrooke QC Shia Salem, MD, Toronto ON Vyta Senikas, MD, Ottawa ON SPECIAL CONTRIBUTOR Jon Barrett, MD, Toronto ON GENETICS COMMITTEE R. Douglas Wilson, MD (Chair), Calgary AB François Audibert, MD, Montreal QC Jo-Ann Brock, MD, Halifax NS June Carroll, MD, Toronto ON Lola Cartier, MSc, Montreal QC Alain Gagnon, MD, Vancouver BC Jo-Ann Johnson, MD, Calgary AB Sylvie Langlois, MD, Vancouver BC Lynn Murphy-Kaulbeck, MD, Moncton NB Nanette Okun, MD, Toronto ON Melanie Pastuck, RN, Cochrane AB MATERNAL FETAL MEDICINE COMMITTEE Robert Gagnon, MD, Montreal QC Lynda Hudon, MD (Co-Chair), Montreal QC Melanie Basso, RN, Vancouver BC Hayley Bos, MD, London ON Joan M. Crane, MD, St. John’s NL Gregory Davies, MD, Kingston ON Marie-France Delisle, MD, Vancouver BC Savas Menticoglou, MD, Winnipeg MB William Mundle, MD, Windsor ON Annie Ouellet, MD, Sherbrooke QC Tracy Pressey, MD, Vancouver BC Christy Pylypjuk, MD, Saskatoon SK Anne Roggensack, MD, Calgary AB Frank Sanderson, MD, Saint John NB Disclosure statements have been received from all members of the committees. Key Words: Ultrasound, twins, antenatal, prematurity, cervix, amniotic luid Abstract Objective: To review the literature with respect to the use of diagnostic ultrasound in the management of twin pregnancies. To make recommendations for the best use of ultrasound in twin pregnancies. Outcomes: Reduction in perinatal mortality and morbidity and short- and long-term neonatal morbidity in twin pregnancies. Optimization of ultrasound use in twin pregnancies. J Obstet Gynaecol Can 2011;33(6):643–656