Document Detail

Estimators of birth weight in pregnant women requiring insulin: a comparison of seven sonographic models.
MedLine Citation:
PMID:  7898834     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To determine if the relative accuracy of the sonographic estimate of birth weight among diabetic gravidas requiring insulin improves significantly as more fetal measurements are used. METHODS: We studied 172 diabetic women requiring insulin who had sonographic measurements of fetal parts within 7 days of delivery. Friedman nonparametric analysis of variance followed by Dunn multiple comparison and chi 2 were used to assess the relative accuracy of the seven models. Prediction limits were calculated to determine the estimate of fetal weight that would ensure (with 90% accuracy) that the newborn was macrosomic (at least 4 kg). RESULTS: The mean (+/- standard deviation [SD]) birth weight was 3388 +/- 727 g, and the frequency of macrosomia at term gestation was 19.4% (29 of 149). The mean standardized absolute error (g/kg) based on abdominal circumference (AC) and femur length (FL) (86 +/- 72 g/kg) was not significantly different from the other models (range 84 +/- 72 to 116 +/- 99 g/kg, P > .05). The percent of estimate within 10% of actual birth weight using AC and FL (65%) was similar to the other models (53.4-66.2%). Regardless of the White classification, the estimation of fetal weight using AC and FL had an accuracy similar to the other six regression equations. To ensure that the birth weight is at most 3999 g, the estimated fetal weight should be 3200 g, and, conversely, if the predicted weight is 4700 g, then the newborn is macrosomic. CONCLUSION: Among patients requiring insulin, estimation of birth weight using AC and FL is as accurate as more complicated models. The ability to detect macrosomia by ultrasound is limited.
R A McLaren; J L Puckett; S P Chauhan
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article    
Journal Detail:
Title:  Obstetrics and gynecology     Volume:  85     ISSN:  0029-7844     ISO Abbreviation:  Obstet Gynecol     Publication Date:  1995 Apr 
Date Detail:
Created Date:  1995-04-25     Completed Date:  1995-04-25     Revised Date:  2009-10-26    
Medline Journal Info:
Nlm Unique ID:  0401101     Medline TA:  Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  565-9     Citation Subset:  AIM; IM    
Department of Obstetrics and Gynecology, University of Illinois College of Medicine at Peoria.
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MeSH Terms
Birth Weight*
Diabetes Mellitus, Type 1 / epidemiology,  ultrasonography*
Embryonic and Fetal Development / physiology
Fetal Macrosomia / epidemiology,  physiopathology,  ultrasonography
Infant, Newborn
Models, Theoretical
Predictive Value of Tests
Pregnancy in Diabetics / epidemiology,  ultrasonography*
Regression Analysis
Reproducibility of Results
Retrospective Studies
Sensitivity and Specificity
Ultrasonography, Prenatal / methods*

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

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