Prediction of birth weight discordance from fetal weight estimations at 21–24 weeks’ scans in monochorionic and dichorionic twins

Alexandra Queirós, Isaac Blickstein, Sandra Valdoleiros, Nisa Felix, Alvaro Cohen, Teresinha Simões

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Objective: To evaluate if inter-twin estimated fetal weight (EFW) differences at 21–24 weeks’ scans predict birth weight discordance in monochorionic and dichorionic twins born at three gestational age periods. Methods: We counted the number of pairs with discordant EFWs (EFWs greater than the mean + 1SD; i.e. a difference above 12% in dichorionic and 21% in monochorionic twins) derived during a 21–24 weeks’ scan as compared to actual discordant birth weight (>25%) in monochorionic and dichorionic pairs born at ≤32, 33–36 and >36 weeks. Results: We studied 416 dichorionic and 244 monochorionic twins. The frequency of EFWs discordance at 21–24 weeks was the same for dichorionic and monochorionic twins but the total number of birth weight discordant pairs was significantly smaller among dichorionic twins (OR 0.2, 95% CI 0.1, 0.6). Generally, the positive predictive values for birth weight discordance by using the EFWs difference were quite poor, but always better in monochorionic than in dichorionic twins. Whereas the negative predictive value and hence the sensitivity for monochorionic twins was 100% irrespective of gestational age at birth, it was much lower in the dichorionic pairs. Conclusion: Concordant EFWs at 21–24 weeks exclude discordant birth weight in monochorionic twins whereas discordant EFWs are poor predictors of birth weight discordance especially in dichorionic twins irrespective when the twins were born.

Original languageEnglish
Pages (from-to)1944-1947
Number of pages4
JournalJournal of Maternal-Fetal and Neonatal Medicine
Volume30
Issue number16
DOIs
Publication statusPublished - 18 Aug 2017

Keywords

  • dichorionic twins
  • discordant growth
  • estimated fetal weight
  • Monochorionic twins
  • sensitivity
  • specificity

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