Ethnic variation of fetal nasal bone length between 11-14 weeks' gestation.

Objective: We sought to compare the fetal nasal bone length (FNBL) between different ethnic groups at 11-14 weeks' gestation.

Methods: FNBL and the FNBL/CRL ratio were measured in patients undergoing first trimester ultrasound for nuchal translucency (NT) and the ethnicity of the patient was recorded under four categories: non-Hispanic White, non-Hispanic black, Hispanic, and Chinese.

Results: Two hundred and one patients were included in the study.