Document Detail

Fetal gender and sonographic assessment of crown-rump length: implications for multifetal pregnancy reduction.
MedLine Citation:
PMID:  15343593     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: Fetal size is a common criterion for the selection of an individual fetus to be reduced during multifetal pregnancy reduction. We investigated whether a difference in crown-rump length (CRL) exists between male and female fetuses at 9-13 weeks' gestation. METHODS: A total of 883 singleton pregnancies was evaluated at the time of chorionic villus sampling. The mean gestational age at the time of intervention was 10.9 weeks. Pregnancies were dated by certain last menstrual period (LMP). Pregnancies with uncertain dating by LMP or with a sonographic difference of gestational age > 1 week compared with LMP were excluded, as were all cases with chromosomal abnormalities. CRL differences between male and female fetuses were compared using Student's t-test. RESULTS: A total of 417 female and 466 male fetuses fulfilled our study criteria. Their gestational ages ranged between 9.3 and 13.9 weeks. We found no significant difference in size between the male and female fetuses. CONCLUSION: Using the CRL to guide multifetal pregnancy reduction should not result in a clinically significant selection of either gender.
S Becker; S Ural; T Fehm; J Bienstock
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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:  24     ISSN:  0960-7692     ISO Abbreviation:  Ultrasound Obstet Gynecol     Publication Date:  2004 Sep 
Date Detail:
Created Date:  2004-09-02     Completed Date:  2004-10-05     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9108340     Medline TA:  Ultrasound Obstet Gynecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  399-401     Citation Subset:  IM    
Copyright Information:
Copyright 2004 ISUOG
Department of Gynecology and Obstetrics, Division of Maternal Fetal Medicine, Johns Hopkins Hospital, Baltimore, USA.
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MeSH Terms
Crown-Rump Length*
Gestational Age
Pregnancy Reduction, Multifetal*
Pregnancy, Multiple*
Prospective Studies
Sex Characteristics*
Sex Factors
Ultrasonography, Prenatal / methods*

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