Document Detail

The lambda sign at 10-14 weeks of gestation as a predictor of chorionicity in twin pregnancies.
MedLine Citation:
PMID:  8807758     Owner:  NLM     Status:  MEDLINE    
Chorionicity was prospectively determined in 369 twin pregnancies by ultrasound at 10-14 weeks of gestation. Pregnancies were classified as monochorionic if there was a single placental mass in the absence of the lambda sign at the inter-twin membrane-placental junction, and dichorionic if there was a single placental mass but the lambda sign was present, or the placentas were not adjacent to each other. In 81 (22%) cases, the pregnancies were classified as monochorionic and in 288 (78%) as dichorionic. Pregnancy outcome was available in 279 cases and all 63 of these pregnancies classified as monochorionic resulted in the delivery of same-sex twins. Similarly, all 100 different-sex pairs were correctly classified as dichorionic. These findings demonstrate the high reliability of ultrasound examination at 10-14 weeks of gestation in determining chorionicity in twin pregnancies.
W Sepulveda; N J Sebire; K Hughes; A Odibo; K H Nicolaides
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology     Volume:  7     ISSN:  0960-7692     ISO Abbreviation:  Ultrasound Obstet Gynecol     Publication Date:  1996 Jun 
Date Detail:
Created Date:  1996-11-22     Completed Date:  1996-11-22     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9108340     Medline TA:  Ultrasound Obstet Gynecol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  421-3     Citation Subset:  IM    
Harris Birthright Research Centre for Fetal Medicine, King's College Hospital Medical School, London, UK.
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MeSH Terms
Chorion / ultrasonography*
Gestational Age
Predictive Value of Tests
Pregnancy Outcome
Pregnancy Trimester, First*
Pregnancy, Multiple*
Reproducibility of Results
Retrospective Studies
Ultrasonography, Prenatal*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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