Effect of fetal presentation on sonographic estimation of fetal weight according to different formulas

Anat Shmueli, Amir Aviram, Ron Bardin, Arnon Wiznitzer, Rony Chen, Rinat Gabbay-Benziv

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: To compare the accuracy of various sonographic estimation of fetal weight (sEFW) formulas for breech-presenting fetuses. Methods: A retrospective analysis of sEFW performed within 3 days of delivery in a tertiary medical center in Israel between July 2007 and December 2014 was conducted. Breech-presenting singleton fetuses were matched by sex and birth weight to vertex-presenting fetuses. sEFW was calculated using 21 formulas. Systematic and random errors, proportion of estimates (POE) within 10% of actual birth weight, and reliability analysis were used to compare sonographic accuracy. The best performing formula was determined by Euclidean distance. Results: Both groups contained 274 fetuses. Systematic error was lower for breech fetuses when compared with control fetuses in 17 of 21 formulas; there was no significant difference in random error between the breech and vertex groups. For vertex fetuses, Euclidean distance was smaller in 17 of 21 formulas, and POE within 10% of birth weight was higher in most formulas. Cronbach α value was higher for vertex fetuses than for breech fetuses in all formulas. The formulas of Combs et al. and Hadlock et al. were highest ranking for breech-presenting fetuses. Conclusion: sEFW might be more accurate for vertex than for breech fetuses.

Original languageEnglish
Pages (from-to)234-240
Number of pages7
JournalInternational Journal of Gynecology and Obstetrics
Volume137
Issue number3
DOIs
StatePublished - Jun 2017

Keywords

  • Fetal biometry
  • Fetal presentation
  • Growth formulas
  • Sonographic estimated fetal weight

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