| Influence of ultrasound-to-delivery interval and maternal-fetal characteristics on validity of estimated fetal weight. | |
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MedLine Citation:
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PMID: 20069655 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: To explore the effects of ultrasound-to-delivery interval and maternal-fetal characteristics on the distribution of measurement error in estimated fetal weights (EFWs), and to determine the predictive ability of EFW for diagnosis of small-for-gestational age (SGA) and large-for-gestational age (LGA) among infants delivered within 1 day of an ultrasound examination. METHODS: Percentage differences between EFW and birth weights were calculated in 3697 pregnancies. Linear regression was used to compare the accuracy of EFW for births on each of the 6 days after an ultrasound scan with the accuracy observed among births on the same day. The sensitivity, specificity, positive predictive value (PPV) and negative predictive value for diagnosis of SGA and LGA according to EFW was assessed. RESULTS: The mean +/- SD percentage difference among deliveries within 1 day of the last ultrasound scan was 0.2 +/- 9.0%. Mean percentage differences were not significantly different from day 0 on days 1, 2 and 3; however, combining the data from these 4 days obscured a slight bias towards an overestimation of weight evident on day 0 and day 1. Among deliveries within 1 day of an ultrasound scan, the PPV was 61% for SGA diagnosis and 54% for LGA diagnosis. CONCLUSION: Combining data from births > 1 day after the last ultrasound examination may lead to a false conclusion that there is systematic underestimation of weight. EFW tended to underestimate the weight of macrosomic fetuses and overestimate that of small fetuses which limited sensitivity and PPV. Maternal-fetal characteristics are weak predictors of individual errors in EFW. |
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Authors:
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J M Cohen; J A Hutcheon; M S Kramer; K S Joseph; H Abenhaim; R W Platt |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology Volume: 35 ISSN: 1469-0705 ISO Abbreviation: Ultrasound Obstet Gynecol Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-04-07 Completed Date: 2010-09-29 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9108340 Medline TA: Ultrasound Obstet Gynecol Country: England |
Other Details:
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Languages: eng Pagination: 434-41 Citation Subset: IM |
Copyright Information:
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Copyright 2009 ISUOG. Published by John Wiley & Sons, Ltd. |
Affiliation:
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Department of Biostatistics, The Montreal Children's Hospital Research Institute, Montreal, QC, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Birth Weight* Canada Female Fetal Weight* Gestational Age Humans Infant, Newborn Obesity Predictive Value of Tests Pregnancy Pregnancy Outcome Pregnancy in Diabetics Reference Values Reproducibility of Results Ultrasonography, Prenatal* |
| Grant Support | |
ID/Acronym/Agency:
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MOP-84379//Canadian Institutes of Health Research |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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