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Related Experiment Videos

Scanning for chorionicity: comparison between sonographers and perinatologists.

Boaz Weisz1, Pranav Pandya, Raj Dave

  • 1Department of Obstetrics and Gynaecology, University College London, London, UK. b.weisz@ucl.ac.uk

Prenatal Diagnosis
|September 20, 2005
PubMed
Summary

Sonographers accurately determine dichorionic/diamniotic (DC/DA) twin chorionicity before 14 weeks. Relying on their early diagnosis for DC/DA pregnancies is safe and efficient, potentially reducing unnecessary referrals.

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Area of Science:

  • Maternal-Fetal Medicine
  • Diagnostic Ultrasound
  • Obstetrics

Background:

  • Prenatal diagnosis of twin chorionicity is crucial for management.
  • Current practice involves sonographer screening followed by specialist confirmation for monochorionic pregnancies.
  • The accuracy of initial sonographer assessments needs evaluation.

Purpose of the Study:

  • To compare chorionicity diagnoses made by sonographers versus fetal medicine specialists.
  • To assess the efficiency and safety of the current twin pregnancy screening strategy.

Main Methods:

  • Prospective cohort study of 172 twin pregnancies over 4 years.
  • Initial ultrasound (US) scan at 11-14 weeks by sonographers.
  • Second scan by Fetal Medicine Unit (FMU) specialists.

Related Experiment Videos

  • Chorionicity confirmation by inter-twin membrane examination post-delivery.

    • Main Results:

    • Overall concordance in chorionicity determination was 90.1%.
    • Discordant results were rare for dichorionic pregnancies (0.8%).
    • Monochorionic diamniotic pregnancies had a 5.5% discordant rate; monoamniotic pregnancies were over-diagnosed by US technicians.

    Conclusions:

    • Sonographers accurately determine dichorionic/diamniotic (DC/DA) chorionicity before 14 weeks.
    • Relying on sonographer diagnosis for DC/DA pregnancies is efficient and safe.
    • Referral for chorionicity confirmation in DC/DA cases could be deferred or eliminated.