Fetal biometry: does patient ethnicity matter?

Area of Science:

• Perinatal medicine
• Fetal development
• Medical imaging

Background:

• Standardized fetal growth curves are widely used in prenatal care.
• Potential ethnic variations in fetal growth may impact diagnostic accuracy.
• Accurate fetal biometry is crucial for assessing fetal well-being and growth.

Purpose of the Study:

• To investigate potential ethnic differences in fetal biometry.
• To determine if race influences measurements of fetal growth parameters.
• To assess the applicability of universal fetal growth curves across different ethnicities.

Main Methods:

• Retrospective review of prenatal ultrasound data from 2009-2010.
• Inclusion of singleton pregnancies between 17 and 22.9 weeks gestation.
• Exclusion of pregnancies with fetal anomalies, IUGR, or other complicating factors.
• Comparison of biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), femur length (FL), and humerus length (HL) between African American, Caucasian, and Hispanic groups.

Main Results:

• African American fetuses exhibited significantly smaller abdominal circumferences (AC) compared to Caucasian fetuses (p=0.008).
• No significant differences were observed in biparietal diameter (BPD), head circumference (HC), femur length (FL), or humerus length (HL) between African American and Caucasian groups.
• No biometric differences were found between Hispanic fetuses and either Caucasian or African American fetuses.

Conclusions:

• A universal fetal growth curve is not appropriate for all ethnicities.
• Smaller AC in African American fetuses during the second trimester may lead to overestimation of growth restriction.
• Development of ethnicity-specific fetal growth curves is recommended to improve diagnostic accuracy and reduce unnecessary interventions.