Femur length/abdominal circumference ratio. Poor predictor of macrosomic fetuses in diabetic mothers

C. B. Benson, P. M. Doubilet, D. H. Saltzman, M. F. Greene, T. B. Jones

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Antenatal diagnosis of fetal macrosomia can affect the management of diabetic mothers. Because the sonographically determined femur length/abdominal circumference (FL/AC) ratio has been shown to differ in macrosomic and non-macrosomic fetuses (in a population containing few diabetics), its value in establishing the diagnosis of macrosomia was examined. The results indicate that the FL/AC ratio differs in non-macrosomic (20.4 ± 1.6) and macrosomic (19.5 ± 1.4) fetuses of diabetic mothers, but there is considerable overlap. For no cutoff value is there a high sensitivity and high specificity. The positive predictive value is 36-43 per cent (depending on the cut-off), only slightly greater than the prevalence (26 per cent in the study population). The authors conclude that the FL/AC ratio is not useful in predicting macrosomia among diabetic mothers.

Original languageEnglish
Pages (from-to)141-144
Number of pages4
JournalJournal of Ultrasound in Medicine
Volume5
Issue number3
DOIs
StatePublished - 1986
Externally publishedYes

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