Clinical and sonographic fetal weight estimates in active labor with ruptured membranes

Peer Dar, Ifat Weiner, Ora Sofrin, Gay S. Sachs, Ian Bukovsky, Shlomo Arieli

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


OBJECTIVE: To determine and compare the accuracy of clinical and sonographic estimates of fetal weight (EFW) in active labor with ruptured membranes. STUDY DESIGN: Clinical and sonographic EFWs were obtained on 107 term patients in active labor, with cervical dilatation of 4 cm or more and ruptured membranes. Accuracy of birth weight was determined by calculating percentage error, absolute percentage error and ratio of estimates within 10% of actual birth weight for all stages of labor. Statistical analysis was by paired t test, Wilcoxon sign test, x 2 test and Mann-Whitney U test; P < .05 was considered significant. RESULTS: Absolute percentage errors were lower by the sonographic method at all stages. Except for the second stage of labor, the rates of birth weight ± 10% were higher with the sonographic method than with the clinical method (83.17% vs. 60.75% and 84.9% vs. 63.44%, respectively). Estimations performed in the first stage were more accurate than in the second stage with both methods (absolute error of 7.82 ± 5.5 vs.12.38 ± 4.9 for clinical and 5.44 ± 5.99 vs. 9.08 ± 3.19 for sonographic). CONCLUSION: During active labor with ruptured membranes, sonographic EFWs are more accurate than clinical estimations. The accuracy of both methods is reduced during the second stage of labor.

Original languageEnglish (US)
Pages (from-to)390-394
Number of pages5
JournalJournal of Reproductive Medicine for the Obstetrician and Gynecologist
Issue number5
StatePublished - Jun 22 2000
Externally publishedYes


  • Fetal weight estimates
  • Fetus
  • Labor

ASJC Scopus subject areas

  • Reproductive Medicine
  • Obstetrics and Gynecology


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