Cerebroplacental ratio
Dr Bruno Di Muzio et al.
Cerebroplacental ratio (CPR) is an important obstetric ultrasound tool used as a predictor of adverse pregnancy outcome and is calculated by dividing the Doppler pulsatile indices of the middle cerebral artery (MCA) by the umbilical artery (UA).
The index will reflect mild increased in placental resistance with mild reductions in the fetal brain vascular resistance.
Practical points
CPR is an earlier marker of growth restriction
Related articles
Ultrasound - obstetric
- ultrasound (introduction)
- obstetric ultrasound
- first trimester and early pregnancy
- ectopic pregnancy
- multiple gestations
- subchorionic hematoma
- failed early pregnancy
-
second trimester
- fetal biometry
- fetal morphology assessment
- fetal echocardiography views
- nonvisualisation of the fetal stomach
-
soft markers
- nuchal fold thickness
- ventriculomegaly
- absent nasal bone
- choroid plexus cysts
- enlarged cisterna magna
- shortened fetal long bones
- echogenic intracardiac focus (EIF)
- echogenic fetal bowel
- aberrant right sublavian artery
- fetal pyelectasis / fetal renal pelvic dilatation
- single umbilical artery
- sandal gap toes
- amnioreduction
- Doppler ultrasound
- nuchal translucency
- chorionic villus sampling (CVS) and amniocentesis
- placenta
- other
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