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Humerus length evaluation in different ethnic groups.

Joan M Mastrobattista1, E Rebecca Pschirrer, M Ann Hamrick

  • 1Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Texas Houston Medical School, 77030, USA. joan.m.mastrobattista@uth.tmc.edu

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
|March 3, 2004
PubMed
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Racial differences in fetal humerus length were observed in this study. However, these variations did not impact the effectiveness of humerus length as a screening tool for Down syndrome.

Area of Science:

  • Prenatal diagnosis
  • Fetal biometry
  • Medical genetics

Background:

  • Femoral length is a recognized marker for Down syndrome, with existing research exploring racial variations.
  • The study investigates potential ethnic differences in humerus length during early to mid-gestation.

Purpose of the Study:

  • To test the hypothesis that no racial differences exist in humerus length between 14 and 22 weeks' gestation.
  • To evaluate the impact of observed ethnic variations on Down syndrome detection rates using humerus length.

Main Methods:

  • Retrospective analysis of 1164 singleton fetal sonographic examinations from 1994-2001.
  • Exclusion of cases with anomalies, incomplete data, or undocumented ethnicity.
  • Linear regression used to model humerus length against gestational age across White, Hispanic, African American, Asian, and Eastern Indian groups.

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Main Results:

  • Significant differences in humerus length were found between White fetuses and African American (P < .001) and Asian (P < .001) fetuses.
  • No significant difference in humerus length was observed between White and Hispanic fetuses (P = .98).
  • Standard and ethnic-specific formulas yielded identical sensitivity for Down syndrome detection.

Conclusions:

  • Minor differences in fetal humerus length exist among different ethnic groups.
  • These observed differences do not compromise the utility of humerus length as a Down syndrome screening marker in a diverse population.