A prospective cross‐sectional study to define racial variation in fetal nasal bone length through ultrasound assessment at 18–20 weeks’ gestation

Objective:  An absent or short nasal bone is highly predictive of Down syndrome in Caucasian populations, but Asians may have shorter nasal bones – increasing the false positive rate of screening. We examine differences in nasal bone length (NBL) in Caucasian and Asian populations.

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