Chorionicity

Since the vast majority (>80%) off twin pregnancies is dichorionic, monochorionic pregnancies try of the even worse perinatal effects, are affected by numerous standards specific so you’re able to twins revealing a great placental circulation and need so much more antenatal surveillance. 13

The brand new signs available to dictate chorionicity differ from the gestation and you can, in general, the new medical diagnosis is much more particular the earlier while pregnant brand new twins try assessed. Just before 10 months gestation, the clear presence of two gestational – amniotic and you may yolk sacs – clearly relates to a dichorionic diamniotic (DCDA) pregnancy. 12 Immediately following ten days, how many placental masses can be recognized however, since the monochorionic placentae can be bilobar and thus appear because two collection of masses, which marker is going to be examined inside context from other indicators out of chorionicity such as intertwin membrane layer occurrence, fetal gender and you will levels on intertwin membrane layer. (далее…)