How can doctors tell if you are having identical twins from an ultrasound?
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Depending on the day they split, there are a few options but most identical twins share the placenta and the outermost layer of the sac, but have their own inner sacs (mono di twins). On ultrasound they can see the differences between these sac layers versus fraternal twins. Some identical twins share the inner sac as well, which is a dangerous situation and I can remember the ultrasound techs looking carefully for the membrane that separated them to confirm that wasn’t our case.
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