Association of low pregnancy associated plasma protein-A with increased umbilical artery pulsatility index, in cases of fetal weight between the 3rd and 10th percentiles: a retrospective cohort study.

There is an association of low serum maternal PAPP-A (<0.45 MoM) during the first trimester and increased UA PI (>95th percentile) later in pregnancy, in cases of EFW between the 3rd and 10th percentiles. However, this association is not strong enough alone for low PAPP-A to be a reliable predictor of increased UA PI in this population.