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The ratio between the fetal umbilical artery pulsatility index (UA-PI) and the middle cerebral artery pulsatility index (MCA-PI) is termed the cerebroplacental ratio (CPR). The CPR represents fetal blood flow redistribution at the early stages of placental insufficiency; moreover, it has predictive value for adverse intrapartum and neonatal outcomes. However, internationally accepted reference ranges for CPR are lacking.

rambam maimonides medical journal

Third-trimester Reference Ranges for Cerebroplacental Ratio, Middle Cerebral Artery, and Umbilical Artery Pulsatility Index in Normal-growth Singleton Fetuses in the Israeli Population