Related Experiment Video
Updated: Jan 12, 2026
09:04
Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
Published on: September 5, 2011
15.3K
First trimester scan in twins
Sofia Albuquerque Brás1, Leonor Ferreira1
1Center of Fetal Medicine and Surgery, ULS São José, Rua Viriato 1, 1050-206, Lisbon, Portugal.
Best Practice & Research. Clinical Obstetrics & Gynaecology
|November 1, 2025
Abstract
None:
The first trimester ultrasound, performed between 11 + 0 and 13 + 6 weeks of gestation, plays an important role that goes beyond identifying ultrasound markers for aneuploidies. Its objectives include determining the number of fetuses and assessing chorionicity and amnionicity in cases of twin pregnancies; establishing gestational age; detecting major structural anomalies and evaluating uterine arteries for pre-eclampsia.
