A 39-year-old member asked:
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What does it mean if twins are dichorionic-diamniotic?

1 doctor answer
Dr. Craig Keathley
23 years experience in Obstetrics and Gynecology
Separate sacs: The amniotic sac is actually made of 2 fused membrane layers, the chorion and amnion. Dichorionic diamniotic twins each have a separate placenta with their own two layer sac. Fraternal twins are almost always dichorionic diamniotic because they develop from separate eggs. Identical twins can be dichorionic diamniotic if the fertilized egg splits very early after fertilization.
Answered on Jul 10, 2018
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