How can doctors tell if you are having identical twins from an ultrasound?
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There are some ways to tell, but some times we cannot. Here are the three possibilities:
A) If one is a boy and the other is a girl, we know they are not identical.
B) If they are monochorionic, that is, if they share the same placenta, we know they are identical.
C) However if they are the same sex and are dichorionic (two placentas) they could be either fraternal or identical.
Identical twins can have separate placentas, share a placenta, share an amniotic sac, or even be conjoined, depending on when the twins separate. If they share an amniotic sac (monoamniotic) or if they are conjoined, they always share a placenta. That’s why I didn’t include those possibilities separately above.
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