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Objectives: • To assess the association between sonography-derived cervical length measurement and preterm birth. • To describe the various techniques to measure cervical length using sonography. • To review the natural history of the short cervix. • To review the clinical uses, predictive ability, and utility of sonography-measured short cervix., Outcomes: Reduction in rates of prematurity and/or better identification of those at risk, as well as possible prevention of unnecessary interventions., Intended Users: Clinicians involved in the obstetrical management or cervical imaging of patients at increased risk of a short cervix., Target Population: Women at increased risk of a short cervix or at risk of preterm birth., Evidence: Literature published up to June 2019 was retrieved through searches of PubMed and the Cochrane Library using appropriate controlled vocabulary and key words (preterm labour, ultrasound, cervix, cervical insufficiency, transvaginal, transperineal, cervical length, fibronectin). Results were restricted to general and systematic reviews, randomized controlled trials, controlled clinical trials, and observational studies. There were no date or language restrictions. Grey (unpublished) literature was identified through searching the websites of health technology assessment agencies, clinical practice guideline collections, clinical trial registries, and national and international medical specialty societies., Values: The evidence and this guideline were reviewed by the Diagnostic Imaging Committee of the Society of Obstetricians and Gynaecologists of Canada, and the recommendations were made and graded according to the rankings of the Canadian Task Force on Preventive Health Care (Online Appendix Table A1)., Benefits, Harms, Costs: Preterm birth is a leading cause of perinatal morbidity and mortality. Use of the sonographic technique reviewed in this guideline may help identify women at risk of preterm birth and, in some circumstances, lead to interventions that may reduce the rate of preterm birth. SUMMARY STATEMENTS (CANADIAN TASK FORCE ON PREVENTIVE HEALTH CARE GRADING IN PARENTHESES): RECOMMENDATIONS (CANADIAN TASK FORCE ON PREVENTIVE HEALTH CARE GRADING IN PARENTHESES)., (Copyright © 2020. Published by Elsevier Inc.)

Objective: To review the evidence and provide an opinion as to whether universal cervical length screening to prevent preterm birth should be adopted across Canada., Outcomes: Outcomes evaluated include prevention of preterm birth., Evidence: Literature searches using Knowledge Finder, Medline and Cochrane databases were searched for articles published up to April 2018 on cervical length screening for prevention of preterm birth., Values: The evidence obtained was reviewed and evaluated by the Diagnostic Imaging Committee of the SOGC under the leadership of the principal authors, and recommendations were made according to guidelines developed by the Canadian Task Force on Preventive Health Care., Benefits, Harms, and Costs: The prevention of preterm birth in a cost-effective manner is of significant importance to the health of mothers and their families. This committee opinion will summarize the current evidence for universal cervical length screening to prevent preterm birth in Canada, determine whether it meets the Junger and Wilson criteria for screening tests, and make recommendations as to its use in Canada., Validation: These guidelines have been reviewed and approved by the Diagnostic Imaging Committee of the SOGC and The Society of Obstetricians and Gynaecologists of Canada (SOGC)., Sponsors: The Society of Obstetricians and Gynaecologists of Canada (SOGC)., (Copyright © 2018 The Society of Obstetricians and Gynaecologists of Canada/La Société des obstétriciens et gynécologues du Canada. Published by Elsevier Inc. All rights reserved.)

Objectives: To review (1) the use of ultrasonographic-derived cervical length measurement in predicting preterm birth and (2) interventions associated with a short cervical length., Outcomes: Reduction in rates of prematurity and/or better identification of those at risk, as well as possible prevention of unnecessary interventions., Evidence: Published literature was retrieved through searches of PubMed and The Cochrane Library up to December 2009, using appropriate controlled vocabulary and key words (preterm labour, ultrasound, cervix, incompetent cervix, transvaginal, transperineal, cervical length, fibronectin). Results were restricted to general and systematic reviews, randomized controlled trials/controlled clinical trials, and observational studies. There were no date or language restrictions. Grey (unpublished) literature was identified through searching the websites of health technology assessment and health technology assessment-related agencies, clinical practice guideline collections, clinical trial registries, and national and international medical specialty societies., Values: The evidence and this guideline were reviewed by the Diagnostic Imaging Committee and the Maternal Fetal Medicine Committee of the Society of Obstetricians and Gynaecologists of Canada, and the recommendations were made according to the guidelines developed by The Canadian Task Force on Preventive Health Care (Table 1)., Benefits, Harms, and Costs: Preterm birth is a leading cause of perinatal morbidity and mortality. Use of the ultrasonographic technique reviewed in this guideline may help identify women at risk of preterm birth and, in some circumstances, lead to interventions that may reduce the rate of preterm birth., Sponsors: The Society of Obstetricians and Gynaecologists of Canada SUMMARY STATEMENTS: RECOMMENDATIONS., (Copyright © 2018. Published by Elsevier Inc.)