Can you have a thick membrane with Mo/Di Twins?

There's honestly not enough info out there regarding membrane thickness or thinness and what it indicates. I read all over the place that in order for a pregnancy to be identical (mo/di), you have to have one placenta, and a THIN dividing membrane. Why does it have to be thin? I know I'm missing something here, lol! And if it is of any importance, shouldn't it be for di/di twins as well? My doc thinks that a thin membrane for di/di twins means my chances for identicals could be greater, that it means something more. Hmm, ok, I am totally confused. LOL!!! I have read and read and can find no accurate info out there about why membrane thickness is important in a mo/di pregnancy, but not in a di/di pregnancy.

I did come across a forum where someone that said their Peri told them this:

2 placentas, 2 sacs, and thin 1 layer membrane = Identical.

That is what I have...so does this mean my twins could very well be identical? I can't believe there's NO accurate information out there on this topic! I've read books, talked with my nurse and doctor, and searched the internet. You'd think there would be accurate answers out there since twins aren't exactly a new thing that's just been discovered, LOL!

 

I don't know much about membranes and thickness, but do know that IDs can be in 2 sac with 2 placentas (if they are the same sex). I'm assuming you don't know the sex of them or they are the same sex?

 

Yes, my twins are both boys...so there's no way to know until they're born whether or not they're fraternal or identical. Ughh! LOL!

 

QUOTE(Twins08 @ May 8 2008, 06:31 AM) [snapback]762530[/snapback]
there's no way to know until they're born whether or not they're fraternal or identical. Ughh! LOL!

That's right. No amount of guessing and research will get you your answer, just patience. It all has to do with when the cells divide (if they are ID) and therefore they can not be determined with US.
I've never heard that thickness indicates anything in particular. Maybe that's why there is not much out there about it.

Patience!!

 

QUOTE(Twins08 @ May 8 2008, 10:31 AM) [snapback]762530[/snapback]
Yes, my twins are both boys...so there's no way to know until they're born whether or not they're fraternal or identical. Ughh! LOL!

Yes, if they are born with different blood types you will know then they are frat, if not you will have to get them tested.

 

Yep, if you have di/di twins, then you have to wait until they are born to do DNA tests! If they are mo/di, they are ID. 30% of ID twins are di/di.

The membrane thickness just correlates to how many "layers" there are - the chorion, amniotic sac. If they are mo/di, obviously, there are less layers, since they share the chorionic sac, and so the membrane is just the amniotic sac, as opposed to both.

I don't think there's any way to know unless they are mo/di and share a placenta (not fused). Good luck!

Jenny

 

My results during the u/s were a very thin membrane and two placentas, however I have never been told that I was having ID girls. After the placentas and stuff were sent to the pathologist I asked my OB if she could tell from the report if the girls were ID she said she couldn't. So unless we get ours tested, we won't ever know for sure.

 

Thanks everyone. It's strange that my membrane is SO thin for being di/di! It's been really thin pretty much after I hit 12 weeks. I guess that's pretty normal. I just find all this information to be quite fascinating.

 

We were told that our boys were "definitely" fraternal because they were in seperate sacs with two seperate placentas and a membrane (thin) between them. However, I have since found some info online that says that it is possible for twins to still be identical even with seperate everything. Actually, there is a 30% chance of them being identical even with seperate sacs & placentas. It just means that the egg seperated within 3 days of fertilization. I checked it out because our "fraternal" twins look, literally, just alike. I will post a pic so you can see for yourself. The best thing to do is, after they are born, if you have any doubt, go have them tested. That's what we are doing. Good Luck and congrats on your twins. They are so much fun!


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QUOTE(JVC0625 @ May 9 2008, 02:38 PM) [snapback]764723[/snapback]
We were told that our boys were "definitely" fraternal because they were in seperate sacs with two seperate placentas and a membrane (thin) between them. However, I have since found some info online that says that it is possible for twins to still be identical even with seperate everything. Actually, there is a 30% chance of them being identical even with seperate sacs & placentas. It just means that the egg seperated within 3 days of fertilization. I checked it out because our "fraternal" twins look, literally, just alike. I will post a pic so you can see for yourself. The best thing to do is, after they are born, if you have any doubt, go have them tested. That's what we are doing. Good Luck and congrats on your twins. They are so much fun!
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Oh ya, your twins look a lot alike! I bet they are identical!!!