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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
Summary
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.
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.