title: First-trimester ultrasound: current uses and applications.
abstract: This article is aimed to aid the sonographer and medical care provider in better interpretation and clinical application of first-trimester ultrasound findings in early pregnancy. We review current uses, applications, and interpretations of first-trimester ultrasound. A discussion of basic embryology and normal as well as abnormal first-trimester sonographic findings are discussed. We also cover the utility of the first-trimester ultrasound in screening for fetal aneuploidy. Attention is also given to the role of the first-trimester ultrasound in the prediction of adverse perinatal and maternal outcomes.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, CT, USA. antonette.dulay@yale.edu
authors.forename: Antonette T
authors.initials: AT
authors.lastname: Dulay
authors.forename: Joshua A
authors.initials: JA
authors.lastname: Copel
mesh_terms: D000782:Aneuploidy; D005260:Female; D047109:Fetal Development; D005315:Fetal Diseases / Q000000981:diagnostic imaging*; D005333:Fetus / Q000196:embryology*; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal