Uterine artery pulsatility index in the first trimester: assessment of intersonographer and intersampling site measurement differences.
Piya ChaemsaithongYuen Ha TingKwun Yue Yvonne ChengLiona Chiu Yee PoonTak Yeung LeungDaljit Singh SahotaPublished in: The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians (2017)
The measurement of UtA-PI is sampling site dependent with the potential for significant intersonographer differences despite the availability of a prescriptive measurement protocol. This is an important observation as it implies that sonographer "B" inadvertently measured the UtA-PI at a distal site, not at the level of internal os, compared to those measured by sonographer "A", resulting in a lower DR for early onset PE.