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Abstract：
OBJECTIVE: This guideline reviews the clinical indications for first trimester ultrasound.
RESULTS: Proven clinical benefit has been reported from first trimester ultrasound.
METHODS: A Medline search and bibliography reviews in relevant literature provided the evidence.
METHODS: Content and recommendations were reviewed by the principal authors and the Diagnostic Imaging Committee of the Society of Obstetricians and Gynaecologists of Canada. Levels of evidence were judged as outlined by the Canadian Task Force on Preventive Health Care.
CONCLUSIONS:
RESULTS: Proven clinical benefit has been reported from first trimester ultrasound.
METHODS: A Medline search and bibliography reviews in relevant literature provided the evidence.
METHODS: Content and recommendations were reviewed by the principal authors and the Diagnostic Imaging Committee of the Society of Obstetricians and Gynaecologists of Canada. Levels of evidence were judged as outlined by the Canadian Task Force on Preventive Health Care.
CONCLUSIONS:
摘要：
目的：本指南回顾了妊娠早期超声的临床适应症。
结果：已经报道了妊娠早期超声的临床获益。
方法：相关文献中的Medline搜索和参考书目综述提供了证据。
方法：主要作者和加拿大妇产科医师协会诊断成像委员会对内容和建议进行了审查。根据加拿大预防保健工作组的概述，对证据水平进行了判断。
结论：
结果：已经报道了妊娠早期超声的临床获益。
方法：相关文献中的Medline搜索和参考书目综述提供了证据。
方法：主要作者和加拿大妇产科医师协会诊断成像委员会对内容和建议进行了审查。根据加拿大预防保健工作组的概述，对证据水平进行了判断。
结论：
