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Old Mar 8th, 2011, 12:55 PM   1
Ambersachef
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Identical or Fraternal... how can you tell..or when did you find out?


I know this seems like a silly question. but... how did you find out if you were having fraternal or identical twins and how did they know?
I know that if they are in the same sac then they are autmatically identical.
I went to my last u/s and the tech said that it is possible for mine to be identical even though they are in seperate sacs. He said it was possible for the egg to have split so early on that the babies are in two sacs.
On my u/s the black space between the two isnt big like most ultrasounds i have seen. so i was wondering if anyone else has/had identical twins in seperate sacs?



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Old Mar 8th, 2011, 13:22 PM   2
_Vicky_
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We were told the same thing - although there was lots of room between the cells at six weeks (scan below)

We planned to get the boys tested if we were in doubt once they were born - tamba do one I think for about 80. However the boys had different colouring and by a few weeks old different colour eyes so that answered that question for us.

HTH xx

our 6 week scan



 
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Old Mar 8th, 2011, 15:05 PM   3
mamato2more
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They told us right away that they were fraternal judging by the twin peak sign, the distance between the sacs...They were right..One looks like Daddy, one looks like me!



 
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Old Mar 8th, 2011, 17:06 PM   4
Ambersachef
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Vicky- at my 6 week scan there was a line about 1/4 the size of yours between the two sacs. Because it was so thin thats what made my ultrasound tech think it could possibly be identical.



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Old Mar 8th, 2011, 18:57 PM   5
heyyady
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It is possible to have identicals that are in separate sacks AND separate placentas- if one egg split within the first 3 days. The only way to tell with these types of identicals is to either wait and see as they grow up or have a rather expensive dna test done.

Typically identicals share a placenta, sometimes with separate gestational sacks, sometimes with the same (although it's the scary one if they're in the same sack- LOTS of risk factors), and fraternals have separate placentas and obviously separate sacks.



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Old Mar 8th, 2011, 20:23 PM   6
darkNlovely
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I was wondering the same thimg---good thread.



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Old Mar 9th, 2011, 03:15 AM   7
BeckyD
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If you watch the national geographic 'multiples in the womb' documentary it explains more - have bumped the link separately.
While the babies are still in the womb, the medical professionals need to treat pregnancies differently dependent on whether or not they are growing as:
DCDA - separate chorions and amnions (If you have 2 placentas will always be DCDA - normally fraternal but possibly identical. Can also have a fused placenta if positioned closely together)
MCDA - shared amnion but separate chorions (def identical).
DCDA - shared amnion and chorion - rare and much more risky (def identical).



 
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Old Mar 9th, 2011, 16:10 PM   8
Hannah C
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Ours have separate amniotic sacks, but it isn't clear whether they are sharing one large placenta, or if it is two fused together... Apparently they will be able to tell after I deliver.

We were told that if it is one placenta, they are def. identical, but if it is two, they may be identical but more likely fraternal.

Even though we know they are both boys, it is nice to have a little "we are waiting to find out" mystery.



 
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Old Mar 9th, 2011, 19:35 PM   9
heyyady
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Hannah- how far along were you when they told you that there were twins??



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Old Mar 10th, 2011, 00:06 AM   10
Carebear512
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We found out at 6 weeks. We are having triplets and 2 are identical and 1 fraternal



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