Type of twins questions for the experts :)

Blueyed228

Im sure you guys are sick of getting asked this all the time, but you guys are so knowledgeable about this stuff! 

So I had my first appointment with my MFM on Monday.  I was told I have di-di twins.  I said to the Dr "that makes sense that they are fraternal since we transfered 2".  Thats when he said to me there was a chance that they could still be identical.

I remember seeing a few of you post these great links to different twin types.  I was wondering if this made sense?  That chance has got to be slim to none, no?

Sorry if this is a stupid question.

mamak0328

I don't understand how di di can be identical but I am still new to the multiple scene.

I understood it as di di are completely different sacs, placentas etc so it would have had to of been two eggs but I could very well be wrong.  

 Definitely interested in seeing the more knowledgeable MoM's answers!   

lola0915

Hi blueyed,

I could be wrong but di/di happens if the single embryo splits very early. Since you did IVF and had either a 3 or 5 day transfer, ID twins wouldn't be likely in your case. 

Mine are mo/di so they had to split between 5 to 8 days or just after my 5dt. 

Hope this helps! 

Blueyed228

RWMomma:

Di-di twins can be identical. If the egg splits early, then there will be two sacs and two placentas. Mono-di are always identical. But yes, di-di can be identical. He is correct. The only way you will know for sure is if they are opposite sex or if you have them tested.

This is facinating to me.  Do you have any idea of what the percentage is?

Disclaimer: I fully expect these babies to be fraternal, im just really facinated by how this all works when it comes to twins.  My mind was always on "fraternal" since we did IVF and did 2 embryos.

ETA: We did a 3dt

AmyJoy728

I believe 1/9 di di are identical.

amd1982

My doc told me the same thing at the beginning (that even though our di di twins were separate placentas and sacs, they could be identical).  I was totally confused as well. Obviously the gender scan gives us the knowledge that they are indeed fraternal. I did not do ivf but since I had four mature follicles at time of trigger my doc sincerely doubted that they were identical. Congrats again! 

mars724

I think most people assume di/di with IVF, but I've seen people on here where only one egg has taken and it split, so they had mono/di or mono/mono.

 

kiwi443

AmyJoy728:

I believe 1/9 di di are identical.

Yes, that's correct. Peakay will hopefully share her awesome link . She has diagrams that clearly show the differences between mono/mono, mono/di, and di/di.

macchiatto

Yep, 1/3 of twins are identical and 1/3 of ID twins are di/di so it's not super rare, but with IVF and transferring two I'm guessing the odds would be lower that they are ID. The wiki article on twin types also has some good information.

SquishyMine

Blue!

Have no idea if you will remember me or not from SB - it's been a while - but congratulations on your babies! 

Mrs. Alice

Yep ditto to the other responses.  Di/di identicals are a result of the embryo splitting early like days 1-3.  Since you did IVF and transferred 3 day old embryos, the chances of you having di/di identicals are slim to none.  I think with the exception of one person on here (she ended up doing DNA testing I believe), the only IVF identicals I've seen have presented as mono/di.  Make sense?

Rynleigh

Mrs. Alice:

Yep ditto to the other responses.  Di/di identicals are a result of the embryo splitting early like days 1-3.  Since you did IVF and transferred 3 day old embryos, the chances of you having di/di identicals are slim to none.  I think with the exception of one person on here (she ended up doing DNA testing I believe), the only IVF identicals I've seen have presented as mono/di.  Make sense?

^^This. Di/di twins have a 10-15% chance of being identical in spontaneous pregnancies, but identical di/di twins almost always split within those first three days. If the embryos you transferred were 3-5 days, it is highly unlikely to have them be di/di and identical at the same time - possible, but very, very improbable.  

MamaHook

My twin girls are di/di but my MFM said they could still be identical if the egg split early on, but we won't know unless we do testing when they are born!

kgs0505

My twins are for sure identical because they have been in the same gestastional sac from the beginning.  Now the question is if they are mo/mo or mo/di.  Still waiting to see if the membrane shows up on u/s in a week.

pea-kay

Here ya go:
https://pyjammy.com/?page_id=8529

Raggedy1

Blue! I'm so happy to see you here!  (You should remember me from 3TC and IF)

Mine are MoDi Identical from IVF - We transferred two on day 3 but one didn't take and the other split. Go figure!  I was pretty confused on it all until I went to the MFM.  The RE's ultrasound tech kept saying they might not be "true identicals" (in this critical voice).  I think she was an idiot.  Though, I think what she meant was that they weren't likely to be MoMo, which as far as I know, doesn't mean anything in terms of DNA, so what's not "true" about that?  Irritating!  I liked the wiki page on DiDi / MonoDi/ MonoMono to help me understand what had happened.  Also, in my ultrasound today, the tech said that if I hadn't had an ultrasound early on, early enough to clearly see one chorionic sac, then it might be hard to distinguish between ID and Fraternal.  It's all so confusing.  I'm just still blown away that there's two in there!

WELCOME! 

Blueyed228

Peakay- thank you for that link, it was exactly the one I was looking for!

Squishy- i recognize your pic!  But didnt you have a different sn on tk??

Hi Raggedy

Everyone else, thank you so much for the responses.  Like i said before, I am totally banking on them being fraternal, I  just thought what he said was interesting and curious as to how that could really happen.  I dont want you all to think im one of these people who is obsessed with having identicals!  I am just really interested in how this all works and google was giving me a bunch of junk about it.  Plus I figured IVF twins dont really fit into the statistics the way that spontaneous twins do.

projectbaby2012

Blueyed228:

RWMomma:

Di-di twins can be identical. If the egg splits early, then there will be two sacs and two placentas. Mono-di are always identical. But yes, di-di can be identical. He is correct. The only way you will know for sure is if they are opposite sex or if you have them tested.

This is facinating to me.  Do you have any idea of what the percentage is?

Disclaimer: I fully expect these babies to be fraternal, im just really facinated by how this all works when it comes to twins.  My mind was always on "fraternal" since we did IVF and did 2 embryos.

ETA: We did a 3dt

At our 20W anatomy scan with an MFM, we confirmed we were having 2 boys. They each had their own placenta and sac.  The dr said there was a 30% chance they could be identical - since they are the same sex.  Now that they are here, we know for sure they are not identical. One looks like me, the other like DH.  

 

MelleTX

I to have di/di twins and I did IVF. I transferred 2 5-day blasts so everyone is 99.99999% sure they are fraternal. I asked my OB and MFM if there was any chance they could be identical. It was explained to me that while technically medically possible, it was highly unlikely that a 5 day blast would split and be di/di. Very probable that it could split as there is a theory that the more you mess around with an embryo, the weaker it becomes and the more likely to split, but not be di/di.  

SquishyMine

Blueyed228:

 

Squishy- i recognize your pic!  But didnt you have a different sn on tk??

 

After my wedding I felt exposed with it being an old email and a thing with a vendor calling me after a post. I had a hard time keeping up on conversations at work when they were interesting, but continued lurking.  Pretty dead over there these days.  I can handle the pace of the bump a bit better. Glad you are doing well!

zombiemommy

Di-di can def be identical. It just depends on when the egg splits. The earlier it splits after fertilization, the more likely to have two placentas. I don't remember exact days, but I think it was something like 0-4 days after fertilization a split will result in di-di, 4-8 days it will result in mono-di (that's what we are), and 8+ days it will result in mo-mo.

25% of di-di twins are identical, i think?

Rynleigh

30% of identical twins are di/di - but only 10-15% of di/di twins will be identical... and those statistics apply only to spontaneous conception. Fertility treatments alter the numbers substantially, specifically if you implanted 3-5 day blasts, because it is very rare to split into di/di more than 3 days after fertilization. Nearly all di/di twins resulting from a 3day+ transfer will be fraternal.