Document Detail


Role of fetal length in the prediction of fetal weight.
MedLine Citation:
PMID:  22535715     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: The purpose of this study was to compare the accuracy of routine fetal biometric indices in the prediction of fetal length and to determine whether more accurate sonographic measures of fetal length can improve the accuracy of fetal weight estimation.
METHODS: The accuracy of the common sonographic fetal biometric indices for predicting fetal length was determined using 3689 sonographic weight estimations performed within 3 days before delivery. The fetal length at the time of the sonographic examination was assumed to be equal to the neonatal length, which is routinely measured within 24 hours of delivery. Two new regression models for fetal weight estimation, one with and one without fetal length as an independent variable, were generated to determine the potential contribution of more accurate predictors of fetal length to the accuracy of fetal weight estimation.
RESULTS: Abdominal circumference was a significantly more accurate predictor of fetal length (r = 0.732) compared with femur length (r = 0.712), biparietal diameter (r = 0.644), and head circumference (r = 0.661; P < .05), although each of these biometric indices explained only about 50% of the variance in fetal length (R(2) = 0.423-0.548). The addition of fetal length as an independent variable to a birth weight prediction model significantly improved the model's correlation with birth weight(r = 0.917 versus 0.903; P = .006), systematic error (0.2% versus 0.6%; P < .001), random error (6.7% versus 7.5%; P < .001), mean absolute percent error, and the proportion of estimations within 5% and 10% of birth weight.
CONCLUSIONS: The correlation between routine biometric indices and fetal length is limited. Identification of new fetal sonographic biometric indices with greater predictive accuracy for fetal length may improve the accuracy of fetal weight estimation.
Authors:
Nir Melamed; Yariv Yogev; Nechama Linder; Zeev Efrat; Ron Bardin; Arnon Wiznitzer; Israel Meizner
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine     Volume:  31     ISSN:  1550-9613     ISO Abbreviation:  J Ultrasound Med     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-04-26     Completed Date:  2012-08-13     Revised Date:  2013-05-01    
Medline Journal Info:
Nlm Unique ID:  8211547     Medline TA:  J Ultrasound Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  687-94     Citation Subset:  IM    
Affiliation:
Department of Obstetrics and Gynecology, Helen Schneider Hospital for Women, Rabin Medical Center, 49100 Petah Tiqwa, Israel. nirm@clalit.org.il
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MeSH Terms
Descriptor/Qualifier:
Adult
Biometry / methods
Crown-Rump Length*
Female
Fetal Weight*
Fetus / anatomy & histology*
Gestational Age
Humans
Predictive Value of Tests
Pregnancy
Retrospective Studies
Statistics, Nonparametric
Ultrasonography, Prenatal*
Comments/Corrections
Comment In:
J Ultrasound Med. 2013 Apr;32(4):725   [PMID:  23525403 ]
J Ultrasound Med. 2013 Apr;32(4):725   [PMID:  23525402 ]

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


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