Chorionicity
While the bulk (>80%) off dual pregnancies are dichorionic, monochorionic pregnancies was of worse perinatal effects, are affected by multiple criteria particular so you’re able to twins sharing an excellent placental circulation and want even more antenatal monitoring. thirteen
This new cues available to dictate chorionicity vary of the gestation and you can, generally, the latest medical diagnosis is more particular the earlier in pregnancy the fresh twins is reviewed. Before 10 months gestation, the presence of several gestational – amniotic and you can yolk sacs – obviously relates to a good dichorionic diamniotic (DCDA) maternity. twelve Once 10 weeks, what number of placental people tends to be identified but just like the monochorionic placentae tends to be bilobar which means that come once the one or two type of masses, this marker would be examined when you look at the framework out-of most other indicators away from chorionicity for example intertwin membrane density, fetal sex and you may layers on the intertwin membrane.
The current presence of a beneficial chorionic peak or perhaps the ‘lambda sign‘ ( Shape step one(a) ) always ways a dichorionic maternity when compared to the ‘T sign‘ ( Figure step 1(b) ) that is of a monochorionic pregnancy.Continue reading