Abstract

Purpose: Reference charts for biometric parameters are a substantial implement of prenatal ultrasound screening. Inaccurate reference charts lead to fault clinical decisions. In our daily practice we observed an over- and underestimation of biometric parameters. The aim of this study was to derive reference charts between the 15th and 20th weeks of gestation for biparietal diameter (BPD), occipito-frontal diameter (OFD), head circumference (HC), abdominal circumference (AC), femur length (FL), compare to commonly used curves and evaluating the impact of maternal BMI, ultrasound equipment, fetal gender, and nicotine abuse.

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