Reference ranges of uterine arteries pulsatility index from first to third trimester based on serial Doppler measurements: longitudinal cohort study.

UtA-PI shows a progressive non-linear decrease throughout pregnancy. The new reference ranges for GA-specific UtA-PI constructed with rigorous methodology may have a better impact than previous models for screening placenta-associated diseases in the early stages of pregnancy and yet also for evaluating patients at later potential risk for pregnancy-induced hypertension and/or small for gestational age fetuses. This article is protected by copyright. All rights reserved.