title: Twin pregnancy chorionicity determination in a tertiary care setting.
abstract: Ultrasound determination of chorionicity is most reliable before 14 weeks and subsequently reduces in accuracy with advancing gestation. The aim of this study was to evaluate the accuracy of chorionicity determination in a birth cohort of twin pregnancies. Antenatal ultrasound determination of chorionicity in twin pregnancy was undertaken at suboptimal period of gestation in over twothirds of twin pregnancies. Even in the first trimester of pregnancy, the accuracy of chorionicity determination was lower than previously reported.
authors.affiliation: Foetal Medicine Unit, St George's University of London, London, United Kingdom. thiran_dias@yahoo.com>.
authors.forename: T
authors.initials: T
authors.lastname: Dias
authors.forename: A
authors.initials: A
authors.lastname: Weerasinghe
authors.forename: P
authors.initials: P
authors.lastname: Amarathunga
authors.forename: C
authors.initials: C
authors.lastname: De Silva
authors.forename: B
authors.initials: B
authors.lastname: Thilaganathan
mesh_terms: D000293:Adolescent; D000328:Adult; D002823:Chorion / Q000000981:diagnostic imaging*; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011264:Pregnancy Trimesters; D059285:Pregnancy, Twin; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D062606:Tertiary Care Centers; D016216:Ultrasonography, Prenatal; D055815:Young Adult