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Related Experiment Video

Updated: Jan 12, 2026

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas

Published on: September 5, 2011

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

Summary

This summary is machine-generated.

The first trimester ultrasound is crucial for more than just aneuploidy screening. This early pregnancy scan assesses fetal number, chorionicity, gestational age, major anomalies, and pre-eclampsia risk.

Keywords:

Aneuploidies Fetal malformations First pregnancy trimester Screening Twin pregnancy

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Last Updated: Jan 12, 2026

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas

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Published on: September 5, 2011

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Accurate and Simple Evaluation of Vascular Anastomoses in Monochorionic Placenta using Colored Dye

Accurate and Simple Evaluation of Vascular Anastomoses in Monochorionic Placenta using Colored Dye

Published on: September 5, 2011

Area of Science:

Maternal-fetal medicine
Diagnostic imaging
Obstetrics

Background:

The first trimester ultrasound, typically performed between 11 and 14 weeks of gestation, is a cornerstone of modern prenatal care.
Its utility extends beyond initial screening for chromosomal abnormalities.

Purpose of the Study:

To highlight the multifaceted role of the first trimester ultrasound.
To detail its applications in twin pregnancies, gestational age determination, anomaly detection, and pre-eclampsia risk assessment.

Main Methods:

Utilizing ultrasound technology between 11 weeks 0 days and 13 weeks 6 days of gestation.
Comprehensive fetal and maternal assessment including biometric measurements and Doppler evaluation of uterine arteries.

Main Results:

The scan accurately determines fetal number, chorionicity, and amnionicity in multiple gestations.
It reliably establishes gestational age and detects significant fetal structural abnormalities.
Uterine artery evaluation provides insights into pre-eclampsia risk.

Conclusions:

The first trimester ultrasound is essential for comprehensive prenatal assessment, not limited to aneuploidy screening.
It provides critical information for managing twin pregnancies and predicting pregnancy complications like pre-eclampsia.
This early scan optimizes early detection and management of fetal and maternal conditions.