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Determination of gestational age in twin pregnancy: Which fetal crown-rump length should be used?
MedLine Citation:
PMID:  23279688     Owner:  NLM     Status:  Publisher    
AIM: For twin pregnancy, discrepancies in the crown-rump length (CRL) between two fetuses often exist. Evidence is lacking regarding which fetal CRL should be used for estimation of gestational age (GA). Our aim was to determine whether the larger, smaller or the mean CRL is more accurate in determining the GA in the first trimester of pregnancy. METHODS: This is a retrospective study of twin pregnancies conceived by assisted reproduction. The oocyte retrieval date was used for determination of the true gestational age. CRL dating charts by Robinson, Hadlock and Chitty were used for reference. The values of the larger, smaller and mean CRL were compared with the reference CRL for the corresponding GA, which was obtained from each of the three reference charts. The differences between the reference CRL and measured CRL were calculated. The percentages of which CRL, the larger, smaller or the mean, was closest to the expected reference values were calculated. RESULTS: A total of 52 pairs of twins were included in the study. According to Robinson's chart, the proportion of larger, smaller and mean CRL values that were closest to the reference value was found in 11.5%, 75.0% and 5.8% of cases respectively. The larger, smaller and the mean CRLs were closest to the reference CRL in the Hadlock chart for 28.9%, 44.2% and 19.2% of cases, respectively, and closest to the reference CRL in the Chitty chart for 17.3%, 59.6% and 15.4% of cases, respectively. CONCLUSION: The smaller CRL is more accurate in the estimation of the GA for twin pregnancy compared to the larger or mean CRL values.
Kanika Chaudhuri; Lin-Lin Su; Peng-Cheang Wong; Yiong-Huak Chan; Mahesh A Choolani; Dawn Chia; Arijit Biswas
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-21
Journal Detail:
Title:  The journal of obstetrics and gynaecology research     Volume:  -     ISSN:  1447-0756     ISO Abbreviation:  J. Obstet. Gynaecol. Res.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2013-1-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9612761     Medline TA:  J Obstet Gynaecol Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 The Authors. Journal of Obstetrics and Gynaecology Research © 2012 Japan Society of Obstetrics and Gynecology.
Department of Obstetrics and Gynaecology, National University Hospital, Singapore, Singapore.
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