Chorionicity determination in twin pregnancies: how accurate are we?
Article first published online: 12 DEC 2002
Copyright © 2002 ISUOG
Ultrasound in Obstetrics & Gynecology
Volume 19, Issue 4, pages 350–352, 1 April 2002
How to Cite
Stenhouse, E., Hardwick, C., Maharaj, S., Webb, J., Kelly, T. and Mackenzie, F. M. (2002), Chorionicity determination in twin pregnancies: how accurate are we?. Ultrasound Obstet Gynecol, 19: 350–352. doi: 10.1046/j.1469-0705.2002.00679.x
- Issue published online: 12 DEC 2002
- Article first published online: 12 DEC 2002
- Manuscript Accepted: 16 JAN 2002
- Cited By
- Antenatal assessment;
- Twin pregnancy;
To determine the accuracy of antenatal prediction of chorionicity in twin pregnancies in our institution.
Antenatal chorionicity was determined using the number of placental masses, the presence or absence of a twin peak sign and the fetal sex. The gestational age at assessment was documented. Postnatal diagnosis of chorionicity was determined by neonatal sex and placental pathology.
Chorionicity was correctly determined in 95% of cases (n = 131); 91% of the monochorionic and 96% of the dichorionic pregnancies were correctly determined. If chorionicity was assessed prior to 14 weeks' gestation (n = 96) the correct diagnosis was made in all except one case.
Ultrasound assessment of chorionicity has a high sensitivity and specificity. This is further improved if the assessment is performed prior to 14 weeks' gestation. Copyright © 2002 ISUOG