title: What is the role of routine ultrasonography performed in the first trimester of low-risk pregnancy?
authors.affiliation: Programa Diretrizes, Brazilian Medical Association, Brazil.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Simões
authors.affiliation: Programa Diretrizes, Brazilian Medical Association, Brazil.
authors.forename: Wanderley M
authors.initials: WM
authors.lastname: Bernardo
mesh_terms: D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011295:Prenatal Care / Q000592:standards; D012307:Risk Factors; D016216:Ultrasonography, Prenatal / Q000592:standards*