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A member asked:
Does identical twins have different sacs?
A doctor has provided 1 answer
Some do some don't: If two twins share the same sac, they're identical. (almost always works.) the pathologist who examines the placenta can tell. Identical twins can have two sacs, or one sac; if there are two sacs, there can be one or two chorions. Fraternal twins won't share chorions or sacs.
Answered 7/16/2019
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I have a a sac measures 4.5 weeks and the baby measures 5.5 weeks, is that a chance of twins?
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Scan @ 5+1 one sac with yolk etc but had another sac of fluid could it be twins? And one implanted later then other,& that's why 2nd wasn't visible
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