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had nuchal scan, but not combined due to twins, has anyone else had this.

(7 Posts)
griphook Tue 04-Oct-11 22:46:51

I had my 12 week scan today, turns out that it would have been twins, but one died at around 6 weeks.

Because of this, the sonographer said they could only do the nuchal scan and not the combined as the results would be false as the hormone levels would be higher because of the twin.

have been googling and haven't been able to find anything on the internet about this other nuchal scan for twins

has anyone else had this?

catsareevil Tue 04-Oct-11 22:52:03

The nuchal scan isnt different because of being twins, it is that the bllod test cant be accurately done.

griphook Tue 04-Oct-11 23:00:03

are they correct though in what they are saying, that I can't have the combined test

madhattershouse Tue 04-Oct-11 23:02:05

I was told the same when I was pregnant with twins.

griphook Tue 04-Oct-11 23:11:57

that's interesting as on all the private scan websites it says it's able to do the combined test for twins, and I wasn't sure if they said they couldn't do the blood test as one had died or because they just can't do twins iyswim

HappyAsASandboy Tue 04-Oct-11 23:27:52

I had the combined test alongside my 12 week scan (when having twins). My probabilities came back as both being 1 in 10,000 so the hormones can't have been that high.

What does your midwife say? Or was it her who said you can't have the blood tests?

Yaya70 Wed 05-Oct-11 12:38:03

I had the combined test with twins (at UCLH). I queried whether it was possible to do the bloods as I'd read elsewhere that it wasn't accurate for twins, but I was told it was fine. The algorithm to calculate risks just needs to be amended. With twins the doctor told me that you would expect the HCG to be twice as high as a singleton pregnancy but the PAPP-A is the same in twin/singleton pregnancies. Perhaps they can't do it because one twin has died and so the HCG probably wouldn't be double, but wouldn't be as low as a singletone pregnancy?

Hope this helps.

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