Doppler ultrasound in twin pregnancy

Umbilical and fetal middle cerebral artery Doppler reference ranges in a twin population followed longitudinally from 24 to 38 weeks' gestation

“…It has been hypothesized that this may be because dichorionic placentae experience less ‘placental crowding’ than do monochorionic placentae. A meta‐analysis by Giles of three randomized controlled trials in twin pregnancies showed that Doppler ultrasound was associated with a reduction in unexplained fetal death in utero . As twin biometric parameters for size are frequently plotted on singleton nomograms this may lead to errors in weight estimation, with the potential for growth restriction in one or both twins going undetected.…”