Dichorionic-Diamniotic Twins

Dichorionic-diamniotic (DCDA) is a twin pregnancy where each fetus has its own placenta and amniotic sac. This means that each embryo has its own individual chorion (the outer membrane that develops into the placenta) and amnion (the inner membrane that fills with amniotic fluid and becomes the amniotic sac).

DCDA twins most frequently occur when two eggs are fertilized by two sperm simultaneously (dizygotic twins), but may also be caused by a single zygote (fertilized egg) splitting into two (monozygotic twins).

Assisted reproductive technologies (ART) can increase the chance of becoming pregnant with twins.

Of all twin pregnancies, DCDA twins have the lowest rate of complications.