Kar, the specialist I worked with (and literature supports the nuchal fold meausurement taking place late in the 12th week/early in the 13th) was standard 12.5wks for nuchal fold u/s- this is simply because it is more accurate done later than earlier but we didn't want it too late in case growth made it difficult to measure. Often women would come and be just too early to give an accurate picture and need to return again. Dates can throw things a bit. Your specialist is only 2 days ahead of mine. I am sure you would find if you were 12.5 weeks on a Thursday and there were no appts left until the following Thursday he would do it. Do you know what I mean??? If a woman is close to 13 weeks give or take a day or so...

It sounds like your specialist will not give you the full results on the day because the bloods are being taken on the same day. This will mean that she/he will measure the fold and u/s your baby and give you a risk factor. A few days later you will be contacted with the adjusted risk factor when the blood results become available. Some units do it this way - I am not sure why as there isn't really a medical reason why but doing it this way isn't unusual.

I truly understand how time drags until that ultrasound. I empathise with you ((hugs)). Rest assured though you will get a nice accurate 'picture' of how things are going in wombville! I agree there is often much discrepency between care providers - though most agree on the time frames for nuchal folds now. In the early days it was earlier between 11 and 13 weeks. I think as time has progressed and more experience and knowledge gained we have more information on accuracy.