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Related Experiment Videos

Revisiting first-trimester fetal biometry.

L J Salomon1, J P Bernard, M Duyme

  • 1Service de Gynécologie-Obstétrique, Centre Hospitalier Intercommunal de Poissy-St Germain, Poissy, France.

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
|July 15, 2003
PubMed
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First-trimester fetal biometry charts based on crown-rump length (CRL) are more accurate than those based on gestational age (GA). These CRL-based charts improve prenatal diagnosis and quality control in early pregnancy ultrasound.

Area of Science:

  • Perinatology
  • Medical Imaging
  • Fetal Medicine

Background:

  • First-trimester ultrasound is crucial for diagnosing fetal abnormalities.
  • Fetal biometry based on gestational age (GA) is underutilized in early pregnancy.
  • Crown-rump length (CRL) is a primary measure in early gestation.

Purpose of the Study:

  • To develop and validate CRL-based biometric charts for first-trimester fetal measurements.
  • To compare the accuracy of CRL-based charts versus GA-based charts.
  • To enhance the diagnostic utility of early pregnancy ultrasound.

Main Methods:

  • Prospective collection of biparietal diameter (BPD), head circumference (HC), and abdominal circumference (AC) from 939 normal singleton fetuses.
  • Construction of charts and predictive equations using data from fetuses with CRL between 45-84 mm and normal outcomes.

Related Experiment Videos

  • Correlation of BPD, HC, and AC measurements with CRL in 880 eligible fetuses.

    • Main Results:

    • CRL-based predictive equations and charts were successfully constructed.
    • The standard error of estimates was significantly lower when using CRL compared to GA for all measurements.
    • CRL demonstrated superior accuracy in correlating fetal biometric parameters.

    Conclusions:

    • CRL-based growth charts and predictive equations offer enhanced accuracy over GA-based methods in the first trimester.
    • These CRL-based tools can serve as a quality control measure for first-trimester ultrasound examinations.
    • The charts may aid in the early diagnosis of fetal conditions characterized by growth abnormalities.