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Objective: To determine whether current methods of detecting Down syndrome based on fetal femur length calculations are influenced by gestational age or maternal height.Methods: Four formulas were used to calculate expected femur length (FL) based on the fetal biparietal diameter (BPD) between 15 0/7 weeks' gestation and 19 6/7 weeks' gestation. For each gestational age, the BPD:FL ratio for women...
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