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Am J Obstet Gynecol. 2009 Mar;200(3):340.e1-3. doi: 10.1016/j.ajog.2008.12.043.

Overestimation of fetal weight by ultrasound: does it influence the likelihood of cesarean delivery for labor arrest?

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1
Division of Maternal Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Sciences, University of Texas Health Science Center at Houston, Houston, TX, USA.

Abstract

OBJECTIVE:

We sought to determine whether the overestimation of ultrasound-derived estimated fetal weight (EFW) is associated with increased diagnosis of labor arrest.

STUDY DESIGN:

This is a historical cohort study of nulliparous women with term pregnancies who underwent bedside ultrasound examination for EFW before labor induction. Labor outcomes of women with EFW overestimation > 15% the actual birthweight were compared with those with EFW not overestimated.

RESULTS:

Overestimation of EFW occurred in 9.5% of cases (23/241). The rate of cesarean delivery (CD) for labor arrest was higher for those with EFW overestimation (34.8% vs 13.3%; P = .01) even though there were no differences in length of the induction duration. After adjusting for confounding factors, EFW overestimation remained associated with CD for labor arrest (odds ratio, 4.8; 95% confidence interval, 1.5-15.2).

CONCLUSION:

Our finding suggests that an overestimation of EFW may be associated with a lower threshold for CD for labor arrest.

PMID:
19254597
DOI:
10.1016/j.ajog.2008.12.043
[Indexed for MEDLINE]
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