International journal of gynaecology and obstetrics : the official organ of the International Federation of Gynaecology and Obstetrics
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Int J Gynaecol Obstet · Apr 2006
Review Practice GuidelineSOGC clinical practice guidelines. Ultrasound evaluation of first trimester pregnancy complications. Number 161, June 2005.
First, to review normal embryonic development and the sonographic evidence of early pregnancy failure; second, to review sonographic evidence of ectopic pregnancy. ⋯ There is good (class A) evidence that current ultrasound technology can distinguish between normal and abnormal pregnancies in the first trimester. There is good (class A) evidence that transvaginal ultrasound in conjunction with quantitative-HCG can diagnose ectopic pregnancy.