Evaluation of the adequacy of reference charts for the accurate identification of fetuses with bone length below the 5th percentile

Abstract

AbstractTo identify reference charts for femoral and humeral lengths enabling appropriate identification of fetuses <5Two samples of fetuses aged 14–40 weeks were selected from our institution’s ultrasonographic database. Regression analysis was used to construct reference charts of femoral and humeral lengths based on the local population (n=901). Femur and humerus length measurements from a second sample (n=1240) were transformed intoFor femoral length, one equation other than the local equation yieldedMost reference charts assessed underestimated the number of fetuses with long bone lengths <5