Document Detail

The relation between fetal abdominal circumference and birthweight: findings in 3512 pregnancies.
MedLine Citation:
PMID:  9070136     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To establish the relation between fetal abdominal circumference and birthweight in a large population of fetuses; to identify whether the error in estimating birthweight by abdominal circumference varied with the magnitude of abdominal circumference; and to establish whether adding femur length to abdominal circumference caused a clinically important reduction of error in predicting birthweight. DESIGN: A retrospective study. SETTING: The ultrasound department of a teaching maternity hospital offering a tertiary referral service. SAMPLE: From 3512 nondiabetic women with a normally formed singleton fetus, an abdominal circumference measurement of the infant was made within seven days of delivery; of these, 1213 had a femur length measurement performed at the same time. RESULTS: There was a linear relation between abdominal circumference and birthweight. There was a strong inverse correlation between the proportional error in predicting birthweight from the abdominal circumference and the magnitude of the abdominal circumference. Both the Campbell and Wilkin equation (abdominal circumference alone) and the Hadlock equation (abdominal circumference and femur length) were associated with systematic errors, especially with larger birthweight infants. The median absolute errors for the two equations were not significantly different overall (6.98% and 6.86% respectively), although the Hadlock equation was significantly more accurate in predicting birthweight in infants weighing greater than 4500 g. However, no threshold value of abdominal circumference or of estimated fetal weight using the Hadlock equation had a positive predictive value in estimating infants of > 4500 g of greater than 35%. CONCLUSIONS: Prediction of birthweight should be by abdominal circumference alone. Table 1 presents robust estimates of the error of predicting birthweight using fetal abdominal circumference.
G C Smith; M F Smith; M B McNay; J E Fleming
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  British journal of obstetrics and gynaecology     Volume:  104     ISSN:  0306-5456     ISO Abbreviation:  Br J Obstet Gynaecol     Publication Date:  1997 Feb 
Date Detail:
Created Date:  1997-04-10     Completed Date:  1997-04-10     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7503752     Medline TA:  Br J Obstet Gynaecol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  186-90     Citation Subset:  AIM; IM    
Department of Obstetrics and Gynaecology, Queen Mother's Hospital, Yorkhill NHS Trust, Glasgow.
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MeSH Terms
Birth Weight*
Embryonic and Fetal Development*
Fetal Macrosomia / diagnosis
Retrospective Studies
Sensitivity and Specificity
Ultrasonography, Prenatal

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

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