 Cerebroplacental ratio

The cerebroplacental ratio (CPR) is an important measurement used in obstetrics to assess fetal well-being, particularly in the context of growth-restricted fetuses. It is calculated by comparing the blood flow in the middle cerebral artery (MCA) to the blood flow in the umbilical artery (UA). Typically, ultrasound Doppler studies are used to measure the pulsatility index or velocity of blood flow in these arteries.