Related Experiment Video
Updated: Jun 16, 2026
09:52
Accurate and Simple Evaluation of Vascular Anastomoses in Monochorionic Placenta using Colored Dye
Published on: September 5, 2011
[Diagnosis of chorionicity]
1CHU de Caen, Service de gynécologie-obstétrique et médecine de la reproduction, avenue Georges-Clemenceau, 14000 Caen, France. benoist-gu@chu-caen.fr
Journal De Gynecologie, Obstetrique Et Biologie De La Reproduction
|February 10, 2010
Summary
Early ultrasound diagnosis of chorionicity in twin pregnancies is crucial. The lambda sign around 12 weeks is key for accurate assessment and appropriate management.
Area of Science:
- Maternal-Fetal Medicine
- Diagnostic Imaging
- Reproductive Medicine
Context:
- Accurate chorionicity determination in twin gestations is vital due to differing risks.
- Early diagnosis impacts fetal outcomes and management strategies.
Purpose:
- To outline diagnostic modalities for twin chorionicity.
- To establish reliable methods for early pregnancy assessment.
Summary:
- Ultrasound is the primary diagnostic tool for chorionicity.
- Gestational sac count before 10 weeks and the lambda sign at 12 weeks are highly accurate.
- Later trimester assessments require multiple signs and are less reliable.
Impact:
- Enables timely and appropriate follow-up for twin pregnancies.
- Establishes first-trimester chorionicity as the reference standard.
- Guides clinical management decisions for improved maternal and fetal health.
