DV: ductus venosus; MCA: middle cerebral artery; NST: nonstress test; PI: pulsatility index; sFGR: selective fetal growth restriction; UA: umbilical artery.
* Signs of worsening disease include progression from type 2 to type 3 sFGR, DV PI >95th percentile, development of absent or reversed a-wave in the DV waveform, and oligohydramnios in the sac of the smaller twin.
¶ Deliver sFGR pregnancies with UA reversed end-diastolic flow at 30+0 to 32+0 weeks and those with UA absent end-diastolic flow at 32+0 to 34+0 weeks, in the absence of complications necessitating earlier delivery.