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Related Experiment Videos

Down syndrome screening using race-specific femur length.

Adam F Borgida1, Carolyn Zelop, Michael Deroche

  • 1Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, University of Connecticut School of Medicine, Farmington, USA.

American Journal of Obstetrics and Gynecology
|October 31, 2003
PubMed
Summary

Maternal race does not improve Down syndrome screening accuracy using fetal femur length (FL) and biparietal diameter (BPD). Institution-specific FL data is more effective than published standards for detecting Down syndrome.

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Area of Science:

  • Medical imaging
  • Prenatal diagnostics
  • Genetics

Background:

  • Fetal femur length (FL) and biparietal diameter (BPD) are key biometric parameters used in prenatal screening for Down syndrome.
  • Existing screening models often rely on generalized growth charts, which may not account for population-specific variations.

Purpose of the Study:

  • To evaluate the impact of maternal race on fetal femur length measurements.
  • To determine if race-specific regression models enhance the accuracy of Down syndrome screening compared to institution-specific or published standards.

Main Methods:

  • A retrospective review of patient databases was conducted to collect fetal biometry (15-22 weeks gestation), maternal race, and Down syndrome cases.
  • Institution-specific and race-specific regression lines for FL by BPD were generated.

Related Experiment Videos

  • The efficiency of published FL data was compared against institution-specific and race-specific regressions for Down syndrome screening.

    • Main Results:

    • The study included 4350 African American, 4271 white, 2315 Hispanic, and 654 Asian subjects, with 42 cases of Down syndrome.
    • Institution-specific regression yielded an R(2) of 0.82.
    • Race-specific regressions showed R(2) values ranging from 0.80 to 0.86, but did not offer improved screening efficiency over institution-specific data.

    Conclusions:

    • Institution-specific fetal femur length data is more effective for Down syndrome screening than published expected values.
    • Incorporating maternal race into regression analysis for fetal femur length does not significantly improve the efficiency of Down syndrome screening.