At 10 weeks I had a scan and it turned out I had been carrying twins but one had died at around 8 weeks. I've since read that because my hormone levels may still be higher than expected - the baby that passed away is still visible on scan - it is not appropriate to have the combined nuchal because the blood test results may be skewed. So the risk should be calculated on nuchal measurement alone.
I asked my mw at my booking and she wasn't totally sure. So she took blood but attached the report on the lost twin so the screening people could make a judgement.
Has anyone else been in this situation? At my scan, can I ask the sonographer to disregard the blood results? I assume they will do this anyway if it's the best course of action? The mw told me to take the scan report to the nuchal scan so they can see it.
I'm mostly concerned about getting a false high-risk result.
Thanks
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Antenatal tests
Lost twin at 8 weeks - should Down's risk be calculated on nuchal measurement alone? Is blood part of combined test unreliable?
whenskiesareblue · 08/05/2014 14:59
Thank you for the link madamejosephine and for your kind wishes. It's so confusing, as I had the viability scan at the Fetal Medicine Centre, and they said while Harmony would not be reliable with a lost twin, they would do the combined test - though they said my local hospital might have a different policy. I'm waiting for a FMC doctor to call me back to confirm that's really what they meant since conflicts with lots of other guidance. 
Presumably the sonographer at my NHS nuchal scan will follow those NHS guidelines and disregard the blood results?
Trying to get my head round the loss of a twin I didn't know I was carrying (no family history so a surprise) and all this doubt re the combined test is an extra worry.
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