Update reference charts: Fetal biometry between the 15th and 20th week of gestation

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 nicot…